All that needs to be done now is for her to post a photo of herself holding a piece of paper containing that user name.
Until that happens, due to Ralph being a pathological liar, I would not believe that is her. Guaranteed that we won't see such a pic. And as has been said, even if it was her, good chance Ralph paid her to post that too.
Perhaps if Ralph didn't lie so much it would be accepted and easily believed, but anyone could have made that account and posted that. Or if really her, she could absolutely have been paid to say it.
Ralph has a documented history of being a liar and an abuser, so I think most rational people will find it kind of hard to just take some Twitter posts to exonerate the fat slob.