Absolutely agree, he is showing all the signs of dementia. Saw it in my Dad.
The one thing I might disagree with is the idea the reason he isn't out campaigning much is lacking the stamina to do it. Partly true, but I also think a big part of it is a combination of the assassination attempt totally unnerved him (understandably, as it would unnerve anyone) plus, he knows his campaign events will be no match now for the size and enthusiasm of Kamala's, and he can't cope with that.
Gotta remember the "projection and confession" thing with Trump. It seems to me that his claiming that Kamala's crowd was faked by AI image generation means he has been talking to his people, asking them to AI image generate massive crowds for him. And I'm not joking; I'm serious.