I think it was understandable that he thought was joining gh after wicked. Many others did. It was fine wording, given the limit of twitter. Ppl just misread what she wrote.

That tweet of hers was a month ago. This didn't blow up until MP tweeted about a "gig at GH". So, either no one reads her tweets, or it wasn't misinterpreted when they did.

I get why he misread it. He might not even have a clue Robin's returned (or a character with historical GH ties). He's an actor always lining up his next project.