So just like I've been asking others in the thread, can you provide data throughput, latency, etc of the demo for UE5? Because that might be a critical error in your thinking, as you believe in something you don't have factual data on. This ain't Sweeney first shilling rodeo for consoles, and I don't think this is his last one.
It's odd you say PC cannot do those things that ps5 SSD can do, yet it has better performance on every single game in existence on both performs. You can say is because there are no games built for it, but there is also no proof from you, nor others as to what asset streaming speeds you need for the demo, why ps5 has framedrops with it's uber fast SSD, etc.
I just hope everyone has their expectations set, so when they realize SSD=/=GPU, SSD=/=second gpu, SSD can't bypass the GPU, therefore GPU doesn't have to render a scene. You can't just throw data at the GPU, and expect "fast ssd=fast rendering". If you believe you can do this, then....