I could say 85% yes for being inescapable, since the backrooms is basically an infinite plain of corridors and buzzing sounds, but 15% escapable, just in case, since we have levels here, so what.
I don’t think the backrooms should be inescapable, since The Redacted Watcher doesn’t have full control over that, and one of the aspects of the backrooms I believe, is to escape the backrooms.