This is actually a pretty bad reading of this article (which is also outdated, but the results are still consistent with how we measure today more or less). Yes, there is a statistical imbalance of which groups of people consume porn media, but to use that as an explanation exclusively ignores what we can tell from a culture where porn with trans women is produced for straight men.

And, it’s also a problem to ignore that yes, it is straight men, not closeted queer men. Pretty much all porn is misogynistic and produced with the intent to fulfill some sort of sexual fantasy for straight men, but straight men are also socialized to value sex in terms of power and asserting their power. In a culture where trans women (trans and gnc people in general, but the topic here is trans women) are actively victimized by an explicitly genocidal system, why do you think so many straight men enjoy fantasies that involve trans women and consuming inherently dehumanizing and demeaning pornographic content involving trans women?

Additionally, think about how this relates to the rates at which black cis men or east-asian cis women are fetishized, and what the demographics are of the consumption of that pornographic material are. Yes, there are simply more straight, white, cis men who consume porn, but porn is also produced in a culture that happens to privilege cishet white men more than anyone else, and those men think that they deserve to assert power over others through sex.