No worries, I wouldn't have expected it either. I understand fake accounts for high profile guys like Schefter and Rapoport but who the hell takes time out of their day to make a fake Brian Costello account?
Everything about this thread is wrong. Even if that tweet was true, why would you name the thread that?
Just for future reference look at the account. For higher profile people and reporters there should be a blue check mark that verifies their account.