Before she died she supported Dave, as well.
My main point stands: criticism of his special is too vague. It's almost as if many of the critics never watched the whole thing, having formed an opinion about it early on and stopped watching. I watched the entire thing and it is a single piece. There are no standalone jokes in that special. Every single word is in support of the last words he speaks.
I even watched the special a second time to be sure I hadn't been bamboozled by Dave's wit and charm. I felt even more sure after the 2nd viewing that it's not transphobic.