some Protestants claim that Jesus condemned all oral tradition (e.g., Matt 15:3, 6; Mark 7:8-13). If so, why does He bind His listeners to oral tradition by telling them to obey the scribes and Pharisees when they “sit on Moses’ seat” (Matt 23:2)?

4) some Protestants claim that Jesus condemned all oral tradition (e.g., Matt 15:3, 6; Mark 7:8-13). If so, why does He bind His listeners to oral tradition by telling them to obey the scribes and Pharisees when they “sit on Moses’ seat” (Matt 23:2)?

Jesus bound His listeners to the Word of God they heard through the hypocrites who sat on Moses' seat, not their oral traditions.

According to the Biblical Archaeologist, Moses' Seat was a literal place where the scribes and Pharisees read or exposited the Word of God:

Seating Arrangements
In contrast with the temple building, the synagogue was a place inside which one assembled for prayer and study. The benches for seating have been already noted. In Matt. 23:2 ff. the scribes and Pharisees are criticized for liking the best places at dinners, and the front seats of the synagogues, and for having taken “Moses’ seat.” The front seats were perhaps those nearest the side of orientation, or, as in some synagogues such as at Dura and Beth Alpha, the benches on the side of orientation, to the right and left of the niche or apse. These latter were the seats for the elders, and according to Jewish tradition, the elders sat with their faces towards the people and their backs to Jerusalem (Tosephta, Megillah, IV, 21). The “Seat of Moses” was for the most distinguished elder (presbyter) of the synagogue, and apparently placed closest to the ark. We have seen that there was such a seat at Dura, probably occupied by Samuel, son of Jedaiah, described both as priest and as elder of the Jews, who founded the synagogue. “Seats of Moses” have been found in Palestine at Hammath-by-Tiberias and Chorazin, the latter bearing a memorial inscription.-Wright, G. E., Vol. 7 numbers 1-4: Biblical Archaeologist ( Philadelphia: American Schools of Oriental Research, 2001, c1944).

“The scribes and the Pharisees have seated themselves in Moses’ seat” is the literal translation. There is no record in the Scriptures that God assigned any authority to this group. Their only authority was the Word of God. Therefore, the people were to obey whatever the Pharisees taught from the Word. But the people were not to obey the traditions and the man-made rules of the Pharisees.-Wiersbe, W. W.. The Bible exposition commentary. "An exposition of the New Testament comprising the entire 'BE' series"--Jkt. (Mt 23:1). (Wheaton, Ill.: Victor Books, 1996, c1989)

That this is correct is clear in context as Jesus rebuts their oral traditions:

Matt 23:16 Woe unto you, ye blind guides, which say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is a debtor! 17 Ye fools and blind: for whether is greater, the gold, or the temple that sanctifieth the gold? 18 And, Whosoever shall swear by the altar, it is nothing; but whosoever sweareth by the gift that is upon it, he is guilty. 19 Ye fools and blind: for whether is greater, the gift, or the altar that sanctifieth the gift? 20 Whoso therefore shall swear by the altar, sweareth by it, and by all things thereon. 21 And whoso shall swear by the temple, sweareth by it, and by him that dwelleth therein. 22 And he that shall swear by heaven, sweareth by the throne of God, and by him that sitteth thereon. 23 Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone. 24 Ye blind guides, which strain at a gnat, and swallow a camel.

Hence, when Jesus said "All therefore whatsoever they bid you observe, that observe and do" (Matthew 23:3), He explicitly excluded their oral traditions....

All properly fetched from God's Word, that obey, even if they don't.

Jesus is applying a fundamental principle of sola scriptura, that the Word of God has supreme authority not affected by the hypocrisy of men----All whatsoever is in the Word of God is to be obeyed regardless how sinful those who relayed it.

The extended context confirms this command applies only to the Word of God:

KJV Mark 7:1 Then came together unto him the Pharisees, and certain of the scribes, which came from Jerusalem....7:7 Howbeit in vain do they worship me, teaching for doctrines the commandments of men.

Observe the apostolic application of this to the council:

Acts 5:27 And when they had brought them, they set them before the council: and the high priest asked them, 28 Saying, Did not we straitly command you that ye should not teach in this name?.... 29 Then Peter and the other apostles answered and said, We ought to obey God rather than men.

The council sought to contradict the Word of God....therefore their oral teaching is rejected.

John 14:21 He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.

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The times of this ignorance God winked at; but now commandeth all men every where to repent:

Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.-kjv