Foucault! Finally someone else who sees the irrelevance of biography to philosophical ideas!!!! Maybe biographical information can assist in the interpretation of works of fiction! But in terms of philosophical/political/academic discussion biographical information is totally irrelevant!
In fact if someone cites such information during such discussions or when talking about certain positions that is reason to be deeply suspicious of that person’s motives! I have noticed a lot of religious people will say “So and so is wrong concerning morality! Look at how immoral the life he leads is!”
Even if a philosopher acts contrary to his philosophy that is no discredit to his philosophy!!! I’m sorry but you can’t wriggle out of difficult arguments with such ease! I mean if a thief says stealing is wrong does that mean stealing is right?!