As I've mentioned a couple of times now, I don't think that Trump lies per se, since that implies an awareness of and deliberate misrepresentation of a known truth. Nor do I think he's delusional either though, since that implies a sincere belief in a false reality.
Rather, I think that the part of his brain that's supposed to distinguish between truth and falsehood, and thereby guide and restrict belief, is simply broken.
So broadly, he wants to believe things that make him look good and/or make his competitors look bad, and since he's entirely unable to distonguish between truth and falsehood, he just goes ahead and believes them. And that's part of his appeal - part of the reason that he gets away with saying such things - because he's 100% sincere. There's not even a hint that he's lying or dissembling or doubting himself because he's incapable of it.
So for instance, he has this weird fixation on crowd sizes, and Harris has attracted some large crowds. He doesn't want to believe that because it threatens his ego, so, unable to distinguish between truth and falsehood, he just goes ahead and doesn't believe it. And he needs an alternate explanation, so he casts about, and AI pops into his head, so he just goes ahead and believes that that's what it is. Done and done.
And it just now struck me - the fact that AI manipulation self-evidently was the first explanation that popped into his head means it could be worthwhile to take a closer look at some of Trump's imagery...