If the cipher is ROT-1 of a real phrase, then reversing ROT-1: "thmyl lbt cake mania 2 llkmbywtr" → shift each letter back 1:
t→r, h→f, m→k, y→w, l→j → "rfkwj" — no.
Wait — maybe it’s ROT-13? Let’s check thmyl ROT-13 → guzly — no.
So maybe the cipher is actually to encode? Let’s try shifting the given text back 2:
Given the nonsense result, it’s likely a was applied to an English phrase. Reverse: shift each letter back 1.