Don't get me wrong - it is a whataboutism.
A better defense of Biden is this: The guy is old. Real old. He's slower than he used to be....but that does not mean he is losing the ability to reason or think. He ALWAYS has made gaffes. In every speech. So that is not a sign of anything.
He is slower, but that seems to be it. So far. But a 2+ hour press conference ought to assuage the fears (if they are honest fears and not just partisan bullshit) of those who think he's got dementia
He doesn't.