Being attracted to effeminate men is not being attracted to women. I'm often attracted to effeminate men. My favorite celebrity crush (at the moment) is Troye Sivan, a renowned "twink." I follow StanChris on YouTube, another famous twink. I'm usually (never say never!) not into bears and the hypermasculine. Being attracted to an effeminate man is categorically different from being attracted to women. And this guy had no contact with her penis. She gave him a blowjob, and he didn't know she was trans until somebody told him and then she confirmed it.

Obviously, if he'd been engaging with her penis, nobody would have had to tell him, and she wouldn't have had to confirm it.

Getting a blowjob from a woman is not an act of homosexuality, "undeniable" or otherwise.