As opposed to a recording of a 1 minute video that took a few hours to render on industry hardware.

They ran it on a pretty beefy consumer PC that would cost thousands of dollars, definitely not feasible for ordinary gamers. Point is, it ran real-time on consumer hardware. It's sort of a showcase for what might become mainstream in the future, and what is already possible if you're the type of consumer who buys graphics cards that cost $1k for gaming.