There's no way Caitlyn Jenner is right.
In Thailand there is possibly, arguably, about 25% of prostitutes who are born male presenting as women, because they have a long history of Kathoey, many of whom will will work in the sex trade. *
The other 75% will be females presenting as women or a small minority of males presenting as men.
The majority of prostitutes are actual female women.
The majority of transwomen are attracted to females, so it's unlikely those TW will have sex with men for money. The vast majority of punters paying for prostitutes are men. Unless they're only talking about a country in South East Asia, or maybe Brazil.
All I really care about is that male entitlement to sex enables the sex industry, which harms women overall, even a few of those "women" are male.
*(I have actually been to Thailand, spent a lot of time on the night-scene, and in the pick-up bars I'd say the likelihood of Kathoey was about 10%, but maybe I'm just not perceptive enough and it may have been 25% at a stretch)