I’d say the joke isn’t just about Turing being out of character by characterizing himself in a way he really wasn’t (as in he didn’t really go around saying he was gay, but the UK government made a big deal out of it), but mostly about him being more interested in technological progress that solved something he might have cared about just a bit instead of his own field of research, which he most certainly cared about a lot.

I get that you are concerned, I just think it’s a bit of an overreaction on a site where neither OP nor probably anyone else seeing this meme thought “haha it’s funny because he was gay as in going to hell”.