The conversion therapy aspect is the biggest part of the fantasy. Playing to the idea that gay men can somehow turn straight men. You could say oh it's fine as long as you aren't trying to convert the people who are watching, but it's still treated as conversion therapy.
I don't see gay male porn performers saying they enjoy pussy, however many even do that, as conversion therapy, especially since as so many here love to point out, many of them aren't even gay, and because most of what they are saying is about themselves, not telling all other gay men that they can love pussy or whatever else.
Most of these are also niche, as so much is niche now - the days of porn stars are mostly long gone.