Are people reporting this because he's a tech founder so he must be smart? Because that figure doesn't make any sense at all. Play-to-Earn will be a thing, but 90% of games? Is he aware of how many games exist and how many are passion projects from individual developers and small teams that care about quality vs milking players?
For every Ubisoft, there's a dozen Eric Barone and Tarn Adams that care about creating art and entertainment.
Sorry, that's just a dumb prediction with no basis in reality. If you were to say 90% of worldwide game revenue will come from crypto scams^Hschemes, I would have an easier time believing it.