It is relevant, precisely because it goes to show that it is not hypocritical to maintain that one point of view is correct and all others are false, because we do this in answer to all questions that have mutually exclusive answers (not only in maths). Furthermore if I hold that my point of view alone is correct, that necessarily means the position that 'no point of views are correct' is false. This is not hypocritical, it is a function of holding an exclusive point of view.

(Also: I don't see how this is a Strawman! I have not attacked a misrepresentation of the original argument)