No fake at all I think.
Most well trained (opera) man's voices can get this high, but there are not that many musical pieces making use of it.
It slightly get's out of sync, which is most likely caused by the video on tape , while the sound was recorded through the mixtable, directly on a digital device.
Within 15 minutes of music, tape usually is approx 2 secs off...if you want to sync the digital music track from the same recording.
_________________________
Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76