Most WASs are in a crazy state where they don’t remember things. Many who come out of it afterward will flat out deny having said or done certain things. I think it’s a feature of their depression.
That being said, true dementia can present as mood and behavior changes in some people. For those dealing with a loved one with true dementia, Dr Bredesen has just released a new (and better - more practical) sequel to his first book. It’s called The End of Alzheimer’s PROGRAM (as opposed to his first book which was just The End of Alzheimer’s ).