There were "a couple of grown-ups standing looking very foolish with these little plastic guitars playing to a screen", McCartney says. "And we're going, 'Yeah, all right... It just looks like a really bad band.' They said: 'We really can do a great one with the Beatles, and we'll show you.' So Ringo and I got a bit intrigued."
So, when McCartney says they looked like a really bad band ... is he talking about the people playing or the guys on the screen? Because, yes.