Huge. Maybe biggest ever ridden.
...but I'm skeptical about 100ft.
Look at him when he makes his turn near the bottom of the wave. He's a little hunched over --- maybe (*maybe*) standing 5ft tall at that point. For the wave to be 100ft, you'd need to multiply that height by about 20. When I look at it, I count about 13-14 before you get to the top of the wave.
It's always hard to tell where the bottom of the wave is --- especially from a higher vantage point with a telephoto lens.
Huge? Yes.
Biggest ever surfed? Maybe.
100ft? No.
(My qualifications? Hey, I may live in Oklahoma now, but I grew up surfing in CA. I've done my time watching videos, looking at the mags, and spending time in the water. ...now I'm just an out-of-shape old dude who longboards on CA trips --- I know, just the sort of guy you don't want in the water, right!? :) )