Is all criticism autobiographical?

Sure,

Just as Wilde's reflection on criticism is an example of autobiography by that author.

Quite the way I see it. I looked on with some bemusement, at all of the critiques that Wilde leveled at others, and wondered to myself - "My this was a very interesting man. What was he trying to say to himself."

I think criticism is one way that the mind tries to relate back to itself (feedback), what is is seeing in itself, and what needs to be learned. I always listen closely to my criticism, and wonder, what am I trying to say to myself.

Thanks for the reply.

Rich