Of course we know now. He knew the fix was in, why worry. Also why his mental slips before the campaign about having the best cheating network ever assembled, how he did not need people to vote for him, etc.
All makes sense now. His mental capacity being what it is he slipped up by talking about it.
Absolutely Biden spilled the beans on many occasions in his declining state. Like when he said he didn't need anyone to get elected, but will need his supporters AFTER he's elected. Similar to LBJ, his handlers kept him totally isolated with no interviews toward the end of his life.