I mean... I'd guess he's not an amazing actor too. But having actually seen the episode, you can't tell anything about how good an actor he is, just based on that. He was barely in it. Like, a couple of minutes, two or three lines, he was just a cameo.
It did kind of take me out of the scene a little bit to see him, but he certainly wasn't BAD. And the song he sang was fucking amazing and very fitting for the show.