For the purpose of the discussion, I will not say yes or no.
The Kauer Thesis theorized the Backrooms as a mental projection similar to tulpa, which is spiritual emanation. Taking this into consideration, then it's fair to view the Backrooms as "our nightmare become reality" scenario, rather than limbo or hell, which makes sense to me.
That being said, I know that our work is fiction. I am not going to pretend that the Crimson Wanderer and Storyteller or anyone else are real,