Sure it's all done at the moment—in the service of an overall strategy, one that's simple as it gets, to simply blame everything bad that happens on Biden and the Democrats. That's a strategy, one that he is adhering to quite well. So give it up to him for that, at least. 😁
It doesn't take a guppy or a goldfish to think up a lie in the moment. If he were really as random about what he says as you seem to be implying, wouldn't he be saying roughly 50% of the time that he himself is responsible for the bad things that happen around him? According only to the laws of probability, that's what a guy incapable of a strategy and speaking randomly would end up doing.