a further question might then be what it means for a trans woman to "embrace ultra femininity", given that femininity is just this kind of residual aspect left over after we assign social constructs
well that's what I mean by gender identity ≠ gender roles
that's what is meant by trans people operate in relation to the same constructs as the rest of us
some non-cisgender de facto challenge those constructs more actively than others
trans people are really just one element of what you coudl call people outside of cisgender normativity, which also includes non-binary, genderqueer, etc folk as well as (potentially) femme cisgendered men, butch cisgendered women, etc
trans people are actually the element potentially closest to conventional gender constructs
i.e. if you're a trans man you can embrace conventional masculinity - not all do by any means, but you can and some people do
if you're a non-binary or genderfluid person you de facto challenge male/female constructs