Here is another interview with Gavin Moore for Demon's Soul's from Oct 29th 2020, and again they state it does use RT, for realtime lighting.
https://freegametips.com/this-is-how-demons-souls-was-created-meeting-the-first-great-ps5-exclusive/
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PS5 is the generation that promises to make 4K a standard, do we have some kind of specific resolution and performance mode in Demon’s Souls?
When it comes to performance, we have added two modes. On the one hand, one that is native 4K at 30 FPS, a mode that is impressive to the eye: all active, lights for all loops, shadows, tessellation … it is magnificent. On the other hand, what we have called the performance mode, which is dynamic 4K at 60 FPS.""
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Another word we’ve heard hundreds of times is ray tracing. Are we going to notice it so much? Lighting is a key element in Demon’s Souls.
Indeed, one of the novelties is ray tracing, now you will see more realistically when lightning hits a tree and sets it on fire. That is brand new and never existed in the original. Now we can do it because we have all that power with PS5. It’s great.
Demon’s Souls for PlayStation 3 is an incredibly dark game. What we have done is, after evaluating the power of the PlayStation 5, we realize that we no longer had to activate or deactivate any light source, but we have been able to include light in real time thanks to ray tracing. So every aspect of the game lighting is in real time. It is dynamic. We have used the lighting as a way to guide the player through the levels, as little hints of where to go.""