Of course it is ridiculous. It was intended to be a humorous meme that circulated immediately after the event. Black men support Trump because he offer jobs (not promises) and they see illegals taking jobs. And I bet many of them see Kamala as the kind of woman that has dissed them and married a white guy.
So yes, Trump is doing well among black male voters, but not because he is a convict who was shot yesterday.
Check out this FR thread: Black comedian: Is Trump my uncle?