True.
I think what he said was "I have not shared my questions with the two candidates." I interpreted that as "I only shared my questions with one of the candidates". But it might also mean "My assistant knew the questions and gave them to Joe's assistant." Either way, I think it's clear that Wallace helped Joe as much as he could.
Wallace dislike for Trump was present throughout the debate.
Trump had to fight two people. Biden looked old and frail, and that image is enough for many people to dwell on. Wallace has a little man problem. Wallace was trying to be relevant, when he was only the moderator.