“That they can only be sexually excited by being a woman.”

Isn’t this unspoken and inherently accepted for Cis people though? Why would a Cis woman or Cis man be ‘sexually excited’ by being what they are not? It seems to me that the base assumption is reversed from what it should be.

Also how could they have possibly conducted this is a rigorous manner? Fetishes and Sexual attraction are highly subjective. Ask this question of someone one day and you’ll get a completely different answer than if you had instead asked it another day two months later. Expose to new things (stimulus), Dietary changes (affecting hormones and libido), etc. Equating fetishes to the trans experience even tangentially is extremely transphobic.