This is a political piece thinly veiled as psychology article. I know most people upvote this kind of stories just based on the title and use that as a conversation starter. But we are helping to rank cheap propaganda and I think that is a shame.
Noting Trump as a habitual liar is not contentious, and so it's not propaganda at all. For those who support Trump, as reading between the lines you might (? this is an interpretation of your claim it is 'cheap propaganda' and 'thinly veiled as psychology') it would be disingenuous to claim he doesn't and didn't lie (I note you did not say this, btw); the thing is that _he's supported even though he does lie._ And that's exactly the phenomenon this article is about.