Who knows when he initiated the complaint? This is just the first time it's been made public. He could have asked Kimmel to find new guests months ago. We have no idea.
This is true, we dont know everything. But if it's just now being made public it's probably the first time the fans have heard about this, so people who are going to see him tomorrow are just finding out. I think the uncertainty of whether he's even performing is what sucks for them.