No, it's a guess. There's nothing educated about it. Again Joke's diet isn't helping his brain from deteriorating by the second.
And you don't know what Trump's diet is, much less when he'll croak. Could be tomorrow, could be 10 years. That goes for anyone, regardless of diet. No one knows when their number is up.
As for flubs, Trump's occasional one is Joke's daily. Even other countries are starting to make fun of it.