Yes this would have been 4 years ago. You argued he didnt appear to have dementia, I claimed he did. While he may have been more functional you must admit you were incorrect in your assesment he didnt have dementia.
My argument was not that his dementia at the time made him unfit but it was rapidly progressing and thus unfit for a 4 year term, which was true, and at the time you defended against.
Trump shows signs of stupidity, but no he doesnt show signs of dementia of anykind, just plain old idiocy.