Everyone has been saying he can’t do most of the things he does on a regular basis. I won’t rule out a 4th term, either.
The vast majority of things that Trump does are things that people actually think he can do.
I mean, it is theoretically possible that he becomes an absolute dictator. But so many people would have to change their minds for that to happen that in practice it is very unlikely.
In his previous administration there were at least some checks and balances. This administration is completely unethical in all kind of levels. Frankly I won't be holding my breath.
EDIT: And if you really think his power is absolute, then how is Kilmar Abrego Garcia still in the US?