The hair was a result of when Fox updated the '53 logo around 1976 with a registered trademark symbol superimposed onto it. It likely snuck onto the film gate during the process.

Zardoz (1974) [no hair, no symbol, center framing similar to the older ALI clip]
https://imgur.com/a/goRcNCL

The Omen (1976) [hair and symbol, framing zoomed in slightly to the right similar to 4K77/newer ALI clip]
https://imgur.com/a/p2zIloc

I’m with the sentiment that ALI likely recreated it from a different pre-1976 film source by digitally re-adding the hair and symbol as they couldn’t find the real one in good condition up until now.