We will never know... but if you look into micro-dosing Mushrooms / Psilocybin to treat dementia patients, which is a thing now, that is where I would put my money.
Did you ever have psilocybin? I don’t think that would have the desired effect to keep Biden on track.
I had it once decades ago with a friend. We went to a beautiful place in the woods to do it and it made us surprisingly mellow. And aware of every single detail on the trees, leaves, etc. Not the sort of thing to make your mind logical at all or keep you on track.
Dementia Joe would stand at the podium and get carried away with the beauty of the drapes and the astonishing colors of the lighting. Very different kind of awareness than what a believable speaker needs.