The point is that Larry David can make shows because he is Larry David, not because his comedy is permissible. If his comedy wasn't permissible now we'd have to be living in a authoritarian hellhole.
Yes, people like Hannah Gadsby, who are boring and accord with the present political view.
Your Peep Show argument was a bit ridiculous because there could not be a more politically correct comedian than Robert Webb, who has disavowed a lot of his past comedy.
Yes, a new comedian if they were clever and funny enough would be able to make groundbreaking, clever comedy that would offend some people. Is that clear enough now ?
Hannah Gadsby is a genius. I understand that she may not be for everybody. Especially people that occupy a particular space.
Do you have a source for Webb disavowing his past comedy ? Peep Show in particular because that is what I am talking about, but I would throw in all of the Mitchell and Webb work.