I recently saw the same video and decided to do an analysis of their crazy results, take a look https://news.ycombinator.com/item?id=47148920

genuinely impressed by the amount of effort they put into this video especially the Initial D reference at the end....wow they know their market well

however I remain a skeptic but rolling out my own multiplayer game currently with Godot and Colyseus I'm realizing what they are claiming to do if true will make it much faster to ship.

I am curious none the less