I think he's being sarcastic.
Poe's law needs a grim reaper like avatar, ruining your karma when you thought you were making a joke.
If you try to measure Trump by some conventional, objective-reality based means, he is IMO, probably the worst president America's ever had.
But people didn't vote for him based on such reasons and his supporters don't judge him on such metrics. Trump is a subjective feeling and he makes his base feel pretty great, so...