Here's a video posted 8 years ago where he's talking about it at an event specifically for it. He was still VP at the time of the recording and not running for President.
Look, when my first kid was born in 2001, there were still valid concerns about whether vaccines caused autism. We did a delayed schedule vaccinating her as a result. Years later, it was completely and utterly debunked. But in 2001, we didn't know.
Same with Biden. He absolutely does have a stutter. Whether its reemergence is a sign of his clear mental decline or not, I couldn't tell you, but it's undeniable that he has always had a stutter, and regardless of what we think we know in retrospect, it wasn't unreasonable to think it was just a stutter in 2020.
If so, it was coming from the top, and there was credible evidence passed down to the rank-and-file left. I, personally, had nothing to do w/ any cover-up and I have no shame for what I believed then.
Playing the averages, it's easy to predict significant decline in President Trump over the course of this term. He'll be 82+ at the end of his term -- older than President Biden was when he left office. Do I get credit if I were to predict it now based off of nothing but playing the averages? Are you going to admit fault then for defending his competence now, when many on the left have been pointing to his mental decline since his first term?