"If another mod utilizes only the vanilla light forms this mod will work correctly with it" - TRoaches
So if they moved the bulbs but they're still vanilla bulbs it should still work, so RS should also work. You should basically consider this mod an even more performance friendly version of LLO, if it's compatible with that it will be with this.
Here's a decent alternative, It won't replace the shadows with fake ones but it'll improve them on low settings. https://www.nexusmods.com/skyrim/mods/19632. Might even be worth using so you can use lightweight lighting mods like RS and LLO again since interiors are less performance heavy than outdoors anyway.
I'll test it and tell you (or whoever sees this) what I find on my pos 8 year old potato rig. Maybe potato is kind of harsh, the graphics card is great for 2014 [GTX 970] it's just the wear and tear. I could overclock it but that might damage it more so I won't, that's why I'm on LE instead of SE/AE in the first place, well that and the updates.
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So if they moved the bulbs but they're still vanilla bulbs it should still work, so RS should also work. You should basically consider this mod an even more performance friendly version of LLO, if it's compatible with that it will be with this.
I'm using Imaginator and outdoors the colors are fine but indoors everything looks very oversaturated :(