What evidence? Putting together a story is not necessarily the truth. You have a whole political faction driven by delusions of grandeur and a tendency toward perversion, and you think you can expect them to have an objective perspective on events? Or a realistic assessment where it will lead? Human beings are famously prone to wishful/group thinking and kicking the can down the road. That is only what we are seeing. Trump's remark was only his astute projection of Biden's mental decline.