There is generally room for interpretation with satire, but I am finding it extremely difficult to give this particular person the benefit of the doubt.
If Mel Brooks filmed himself talking about how Nazis are great in an entirely serious tone, other than the bit where he laughed about how funny it was so many Jews died and calling it fantastic (Pogo did exactly this with the Pulse shooting), never releasing the footage, and then years later somebody found the footage and everyone was mad at him for liking Nazis, and then he said it was a joke and people shouldn't be mad at him, then it would be like this situation. But it isn't, it's completely different.
Do you also think the Nixon tapes weren't evidence of Nixon being anti-Semitic? If he had just said he really didn't mean it and he was sorry, it all would have been okay?
If making a several-minute-long homophobic rant 'as a joke' (a joke so funny that he apparently didn't want the public to see it because the video was unlisted), in a way that is entirely indistinguishable from actually hating gay people, is somehow not 'strong evidence' of being homophobic then I have no idea what is.