I think the second point here that Biden is “cognitively fine” only makes sense to people who’ve never seen dementia firsthand. There is a deterioration that flickers off and on in the early years and doesn’t make much sense unless you see it for yourself.
I watched my Mom deteriorate, by her side as her primary caregiver. I also watched that happen to my Grandmother, though I was younger and paying less attention. Either way - this is not that.
Same boat here. A lot of people besides Matt don't realize how their 2nd hand assumptions are going over with those of us who had to deal with the real thing.