UnclGhost comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapters 105-107 - Less Wrong Discussion
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Comments (353)
In short, today either every wizard in Britain is a descendant of Salazar Slytherin or none is. It seems awfully convenient for Quirell to suddenly have a foolproof way to make Harry believe certain claims. It seems to me that the whole "snakes can't lie" thing would have been revealed when Quirell was trying to convince Harry he didn't want to kill Bahry in Azkaban. In fact, that would have shortened that particular discussion considerably, in a situation where time was essential.
It has already been established that ventriloquism and silencing charms exist and that Quirell can do silent and wandless spell casting, so the "two plus two" test could easily have been faked.
Iirc, in canon, the Gaunt family (Voldemort's family) was the last living set of descendants of Salazar Slytherin, and they were very inbred by the time of the books, so it appears that JKR at least provided some workaround for this.
As for the reliability of Parseltongue, there's some precedent for it apparently serving as truth-enforcement. Chapter 49:
Professor Quirrell is known for his aversion to unnecessarily redundant conversation, so it seems likely here that he wants to be sure Harry is telling the truth. Later, in Chapter 66:
It would have helped Quirrell convince Harry in Azkaban, but it's possible he thought it would be more useful for Harry not to know yet how much information his unwittingly-true answers were giving Quirrell.
And might possibly have prompted Harry to insist on hearing about Bellatrix in Parselmouth.
Quirrell didn't reveal that he's a Parselmouth but instead went through the road of transforming in a snake that might not be bound by the Parselmouth truth saying bind.
I think this is strong evidence for Quirrell being bound by the same rules in animagus form. Discounted because he could have very easily been lying there.