Let’s test Atbash on the first word: thmyl → t(20) ↔ g(7), h(8) ↔ s(19), m(13) ↔ n(14), y(25) ↔ b(2), l(12) ↔ o(15) → gsnbo — not obviously English.
t (20) → G h (8) → S m (13) → N y (25) → B l (12) → O So thmyl → gsnbo — not clear. thmyl brnamj strym snayb bbjy llandrwyd
Alternative: Could be a (each letter moved one key on QWERTY). Test: t → y (no). Let’s test Atbash on the first word: thmyl
Atbash mapping: A↔Z, B↔Y, C↔X, etc. Test: t → y (no)
But note: llandrwyd looks Welsh. Atbash on llandrwyd : l(12)↔o(15), l↔o, a(1)↔z(26), n(14)↔m(13), d(4)↔w(23), r(18)↔i(9), w(23)↔d(4), y(25)↔b(2), d(4)↔w(23) → oozmi bdw ? No.
Given the structure (five “words,” the last one llandrwyd looking like a Welsh place name, possibly Llandrwyd ), a likely solution is (A↔Z, B↔Y, etc.), which is common for such puzzles.