Williamson is obviously an athletic and explosive player. The thing that makes him a bit unique is his bulk, which gives him an advantage on power moves. It's eye-popping. That said, there are other players who can make those same athletic plays, and I'm not sure how much the size and strength will be a plus for Zion in the pros. For example, Miles Bridges could have made most of those plays in the videos, aside from the passing plays off the bounce.
Zion is a power player at the wing or forward spot with some developing ball skills, but I can't quite say he's a generational talent given that his length seems fairly average, and his moves are still pretty straight-line. In other words, I'm not sure the extra size and strength are a real advantage. Maybe they allow him to play at the 5 and create a mismatch, like a better version of Draymond Green.