For full disclosure I'm not a member of Sunshine's community and I don't actually watch a lot of the VODs I record, so as far as I know there's no 100% smoking gun confirmation they're transgender.
But I mean there are
a lot of context clues - they only use male lovense toys (including ones specifically designed for penises), they've done a lot of fundraising work for Trans charities, they're a member of the VRC community which has a lot of prominent Trans creators (honestly if they have "VRC" in their name it's pretty likely they're sporting a hidden hotdog lol) and their voice sounds kinda "male presenting" which I admit is a weak argument but it's still a contributing factor.
I'm not here to shame or yuck somebody's yum - I've cranked it to Obkatiekat plenty of times myself - but it's also not my first rodeo and you begin to pick up the signals after you've seen them enough times lol.
General rule of thumb -
if their default lovense sex toy goes up the butt they're probably trans.