Yeah. People with dementia are not always out to lunch so to speak. Early stages and even up until the late stages, my grandmother was lucid pretty often. Those moments became fewer and fewer as time went on. In the end, it was total delusion. Biden is clearly not in an end game type deal, but he is also clearly not well. You have to wonder what the brain surgeries did to him. I also noticed that the disease could remain a kind of steady decline for long periods of time, but one bad event ( she fell an broke her shoulder ) advanced the disease in major way overnight