Not fully disagreeing, but using the size of his detail is not really the best metric. Trump has always maintained and paid for his own massive security detail, even before he was president. It’s less a commentary on what he thinks they may do and more an insight into his concern over his own safety (not a bad thing, I’d be a little paranoid too if I were him).

Not only that, but he is actively holding cabinet meetings at the Winter White House. That makes zero sense unless he’s still president. Not to mention all the photos circulated after Biden’s fake inauguration of Trump’s security detail holding onto the nuclear football. There is no actual evidence that Biden has any presidential powers. Why would he keep Trump’s executive orders alive if he did?