This is super high quality. It doesn't even both me that the pronunciation of the names of the artists involved is difficult for a native speaker (they're both French, so why the ë?). What matters here is that the auditory landscape painted by Olëm is absolutely mind-numbing.
The original version of TÉNÉRÉ's "Tenebris" is certainly worth of a listen in and of itself. If you do so (here), you'll no doubt understand where the intricacy of this remix found its footing. Something about Olëm's rendition makes it a whole lot smoother and easier to digest for me, so I think it'll be the one I keep coming back to. Pretty safe to say they make a rock-solid combo.