If it managed to still get the point across, then it still got the point across. I do think the key in translating The Backrooms lies in that you can't treat it like a straight-forward adaptation (and if it's treated more as an Original-IP along the lines of Jason Universe, Chucky: UKC, or even The Weeknd: Nightmare Trilogy).
You will need someone who is part of the sect to be able to help get the creatives onboard on how to translate. If it's an adaptation of Kane Pixel's indie series of Enter The Backrooms combined with the film, assuming if Murdy, Aiello, and Kane are working together; I could see a case/point made if they try to cherry pick.
Also helps that Murdy doesn't seem to be ruling out indie animation for HHN in consideration. Perhaps I'm off base.