Maybe it's just me, but if that's the difference between no Ray-Tracing, and Ray-Tracing for a game like Metroid, I don't think that effort is worth it for a Switch 2 patch. You're much better off maybe cleaning up some assets, perhaps some high res textures, shadows, etc, higher resolution itself, and if Switch 2 offers it, a 120fps mode.
The baked in lighting is already so freaking good, it kind of makes RT moot IMO. Is there a difference? Yeah, there is, but it's not some massive "OMG!!!!!" difference. I feel the only reason to go with Ray-Tracing would be so the developers don't have to spend the time pre-baking everything in, and save time, and costs, horsepower demands be damned and all.
Now to be clear, this isn't some implementation from Retro, and thus the person who created this does not have all the tools the developer themselves would have. So a proper RT implementation would likely look better. But honestly, this mostly looks kind of meh, and wouldn't be worth the performance penalty IMO.