LOVE me some Andy.. Jer is always slipping in the King riffage too in his demos and they are like easter eggs for me. Gets me everytime with the feels! Andy was always the best part of every album. The songs could be meh but i was always in anticipation of what he was gonna do when his time came.
As for high notes, I think King's voice was burned a while back so he took some rest and rehab to get it back up there. That said, that performance is likely as "live" as Tribute is. They for sure fixed his vocals KISS ALive style. I mean, I'm sure Paul had to practice the line " How you people feelin?!" and " Someone wanna get themselves a KIYASSSS??" until he got it just right and burned to tape.