That's wrong.
Going by many of his previous statements, I fully believe that Trump is not delusional. In fact, I think he is very much aware of what he is doing.
"In the big lie there is always a certain force of credibility; because the broad masses of a nation are always more easily corrupted in the deeper strata of their emotional nature than consciously or voluntarily; and thus in the primitive simplicity of their minds they more readily fall victims to the big lie than the small lie, since they themselves often tell small lies in little matters but would be ashamed to resort to large-scale falsehoods." -
Mein Kampf
This has evolved into a popular propaganda technique known as the Big Lie: "People will believe a big lie sooner than a little one; and if you repeat it frequently enough people will sooner or later believe it."
But Trump's tactic is slightly different. Along with the Big Lie, he's also engaged in many, many small lies, lies about things that it wouldn't make sense to lie about for any other reason. A tactic that is sometimes used to keep opponents off-balance, and overwhelmed trying to keep up with the challenges and refutations to his lies. Skeptics who have debated woos, especially creationists, are well-familiar with this tactic, a variant of which is known as the
Gish Gallop.
Many things that Trump has said make me believe that this is what he is doing, that he is lying because he knows that his base will believe it, and if they don't, it will still make the truth less believable to them, because it will always come not as a revelation, but as a
contradiction to something or someone they already believe it; and it's much harder to change an existing belief than to create a new one. It's a common tactic of fascists and totalitarians, and has been fully embraced by Trump.
Trump lies because he can, because he knows how it plays with his base and against his opponents, and because it makes him feel more powerful and in-control when he does.
I'm not the only one who has made this observation.
https://www.nytimes.com/2017/10/19/opinion/trump-isnt-hitler-but-the-lying.html
https://www.washingtonpost.com/news...big-lie-theyre-worried-about-the-wrong-thing/
https://www.cnn.com/2019/04/03/politics/donald-trump-lies-reasons/index.html