Yeah, it’s been clear from the start that much of Trump’s “strategy” is basically dumb-AI reinforcement learning of “say random things, then repeat - with variation - whatever got positive feedback.” Occasionally I think he says nonsensical things because he’s convinced they’re actually clever points that prove his argument, despite the feedback, though (i.e. the nonsense about needing ID to buy bread - I can’t believe audiences are giving him positive feedback, but he’s repeated that one a number of times).
This doesn’t feel like he’s been positively reinforced, however - instead, he seems to have lost the audience, they’re more confused than anything, when he starts calling Biden (and Hillary) “Obama” (or confuses Jeb with George W Bush). So when he does it, it just seems like a slip. He’s kind of hesitant, too, when he normally spouts nonsense confidently - a sign that he realizes, on some level, that he’s saying the wrong thing, but can’t quite, in the moment, figure out what it is.
