What's just a sidenote in the slides is that they used two 5090s in the demo video. One for the conventional rendering and one for the AI pass. That's too much overhead for what's achieved. If they both run at 100% it's 1200W mindboggling.
Ok, so it's a tech demo. That doesn't change that it looks bad and uses an unreasonable amount of resources to do its thing. Their tech demo has shown that the tech sucks.