Who debunked what? Tim and I say that Lumen and Nanite will be fully supported on next gen consoles and PC. And that UE5 games will run on current gen devices scaled down with tools to use traditional tecniques.
You said this.
Epic also said UE5 projects would be scalable to different hardware, but current gen PC, consoles and mobile wouldn't support these new high end features like Lumen.
Completely wrong. Current gen PC will be getting all of the features, and possibly even more. You never showed any factual data to go against what Tim or the Chinese dev's have said about it running on current PC's. How else do you think the demo was created in the first place? From a Nintendo Switch? Dreamcast? It wasn't the ps5 either. It was created on a current gen PC in case you didn't know