Kate Upton is a woman, she probably has fake boobs, but she's clearly a woman. Her
indent point, or the point at which her hips and torso taper off, is above her navel, which is the case for 99% of women and almost no men. That is not the case, for example, with the Williams sisters, which are more viable candidates for trans men passing as women.
Most of these "actress/celebrity X is a trans man" are deliberately fake viral stories, developed and spread along the lines of the Cass Sunstein cognitive infiltration gameplan (think Flat Earth, which is his masterpiece psyop). That channel above looks like one of these gaslighting jobs, because they skip quickly though her (partially blocked) bikini pictures and try to sell you on her brows, jawline or shoulders, which are still very much within the feminine standards. Had they posted a picture like the one above, it would have destroyed their argument. That's how you can tell they are willfully deceiving people.
Northern European women tend to be athletically built, I've dated a German American athlete in college (crew) that was bigger than Upton, as were all her teammates. She actually dropped out her sophomore year because she didn't like how big she was getting with her training regimen, the program was very competitive, with a history of olympians.
The goal of these psyops is to "infect" skeptic people with false theories that would put normies off and further isolate skeptics from the masses on one hand, and to gaslight the skeptics themselves on the other by mentally destabilizing them and getting to doubt everything.