The thing is, it was already known they were in contact and the politician in question claimed he did nothing sketchy. So he’s not only corrupt, or a traitor to our country, or (most likely) both, he also already publicly lied about it and there is supposedly evidence he actually accepted money. This makes things much worse for him.
His party also already claimed it’s a smear campaign, so if there really is evidence, they’ll look pretty stupid as well (although this really isn’t news).