Popa,
Other than the guy that thinks we can undo all minhagim at the snap of a finger (because Chazal were sexist), the other two, while strange and perhaps misguided, are not rejections of the binding nature of halacha at all. Once again I think you are confusing bad reasoning with a rejection of a portion of the halachic process.
What Rabbi Linzer suggested sounds like a kiruv strategy not some sort of rejection of Chazal. Also you are misusing Occam’s Razor.
When people want very much to reach a specific outcome, their reasoning can get blinded and skewed (consider secular legal opinions). But usually they do not realize that their reasoning is skewed, they think they are making an honest effort. Such a person is not outside the pale, he is just fooling himself.