He is pretty out of it.

Or he is actually an actor who either works for the WHs, or at least likes them a bit better than the people who are paying him, and likes to make them look bad under the cover of his pretend dementia.

Or he is Biden, and rather hates his side by now, and likes playing being more out of it than he actually is so he can do stuff like that sometimes, and make them look as bad as possible. Maybe just because he got his chance to play being the president too late for his taste.

First in - not on my bingo card. Biden gonna endorse Trump right before he dies/executed.