Where does she say it’s not. In fact, she goes out of her way to talk about consent and that no one should be forced to sleep with anyone they don’t want to.
If you are gay and you say you are not attracted to trans men, though, you are saying those trans men are not really men in your mind. Tell me how that isn’t transphobic. Especially since not all trans men are pre- or non-bottom surgery. If a trans man had a penis and testes, you might not even realize he was trans unless he told you. To say you wouldn’t even consider it because he was assigned female at birth is no less transphobic than walking up to a trans woman and calling her “sir,” misgendering a non-binary person (“I don’t care if you want to be called by ‘they’ pronouns. I’m going to call you she because you look like a woman to me”), or calling a trans man “ma’am.”).