They said he’s been working on it all summer. I agree, he wrote it, but had input from others.Disagreed that "it wasn't Biden's" but I'll readily agree he had staff help him write it. It's pure Biden as far as he wanted to say, but it's smart to work with staff writers to ensure what he says is clear enough for most Americans to understand.
We've seen miscommunication on this forum because one poster assumes everyone else thinks and talks just like they do. Obviously that isn't so. The US is one of the largest and most populated nations on the planet. To assume everything someone says is equally understood by the majority is silly.