[I misinterpreted wubbles above; I retract this comment.]
I think we should reserve the "epistemic status" thing for authors to describe their own works. Using it to insult a work seems pointlessly snarky. The useful part could be communicated with just "Probably BS" or "I think this is probably BS". Leaving it at that would avoid the useless connotation about the author's thought process, which is unknowable by others.
I was using it to describe my own comment. I'll try to think of a way to make that clearer in the future.