Reality is subjective
If something like The Backrooms exist, within that Universe, wouldn't it also be part of Reality? Yes, as-of-now, The Backrooms are deemed paranormal, but only because we don't understand how they function, as they seem so alien to us; With some time, we might figure out what makes The Backrooms part of our Reality.
To say that these "Reality Fresheners" make things that are weird go by-bye and therefore make the not-part-of-Reality stuff disappear doesn't make sense, as The Backrooms are a part of that Universe.
-1'd.