Given the time, maybe it’s simply ROT13: t (20) → g (7) h (8) → u (21) m (13) → z (26) y (25) → l (12) l (12) → y (25)
If I reverse each word: thmyl → lymht bbjy → yjbb mwbayl → lyabwm ly → yl alhatf → ftahla thmyl bbjy mwbayl ly alhatf
thmyl → guzly — still no.