He was shirtless. So every guy at the beach is nude by your definition. Dolt.
Shirtless would not require that towel to be below his hips.
That is as close as nude as one can get without dropping that towel.
It’s a reflection of how insane this country is, tweeting a pic like that is offensive to anyone with a basic sense of decency.
Go vote for him, I’m guessing that pic turns you on in some odd way.