For Trump, it's completely different. His strategy is built on two pillars - exposing the existence of the corrupt system and presenting himself as somebody who can fix it. The second part, unfortunately, is completely false and that's where alternative reality comes in - he needs to paint himself as somebody capable of doing a thing he has no idea how to do and no capability to do. That's why he always proposes over the top things - to capture one's imagination and paint himself as somebody who can do things. The proposal itself does not matter, neither the facts he claims to base it on - what matters is the image of somebody who knows how to do things, and has the guts to do them. Since the reality of his capabilities is rather modest, constant stream of fiction is required to keep this idea alive.