So this is not uninteresting:

[Self Esteem]

52. This has always been Trump, tho.

Maybe a bit worse as he gets older but it's identical to his first term. I don't really see it as Trump sundowning (as the way he talks is almost indistinguishable from four or even eight years ago and this is where things would have progressed considerably if he had dementia or something).

The most likely answer is that Trump is extremely lazy and possibly dull. He refuses to actually learn about anything he's talking about and instead attempts to wing it.

In the corporate world, it's referred to as vamping. You basically just say things to get through a question but gussy it up enough that it sounds good enough.

The problem, as I mentioned, is that Trump is likely dull and can't do it. He's like a kid tasked to give an oral book report who refuses to read the book and instead only bases his knowledge of the book on the summary from the back cover.