I don't know if he was heard from the crowd, i was at the b-stage, second row just in front of him (only during the b-stage set) and because of the echo and the crowd going crazy around the stage, it was hard to hear anything. All i can say is that Keith didn't play for at least one, maybe two minutes, due to problem with his guitar, probably with the wireless stuff (don't know the name of that thing).
So the guy you hear on the recording is not Keith, or it is not direct live Keith. Maybe rerecording. Maybe Blondie covering from the backstage, maybe Ronnie higher in the mix, i don't know.
Hard to believe uh? OK, here are the pictures.