I don't mean so much in the sense of what was behind the original idea (whether it was Trump's notion, or an idea put to him by the tech bros who are pleasuring him), but rather the repetitive social media stuff and the ideas bubbling up over and over again when he's talking (the ballroom is/was another one) suggest that thing with dementia where the same idea comes out several times without any indication that they are aware they have said the same thing dozens of times already.