Families everywhere worry about what their loved ones who have dementia are going to say or repeat what they heard.
To the contrary, Joe is a crook first and foremost, whereas most people are comparatively honest. If he weren't a crook he'd be going on and on, disinhibited, about the old days or whatever.
I once met an old farmer who included something in every sentence about a "hog wire fence". "Yeah, the weather's nice today, blahblah hog wire fence." It wasn't his fault, nor was he running for President.