If tnzyl is Atbash: tnzyl → g m a b o → gmabo (nonsense). If tnzyl is Caesar shift +5: ysq dq no.
But bala appears (reversed alab ). Bala is a real town in Gwynedd, Wales. hrb reversed brh — no. But hrb could be hrb → if Atbash of hrb = siy — no. Given time, a likely interpretation: This is a scrambled Welsh phrase with alab = bala (place), llandrwyd = likely a misspelling or anagram of Llandrwyd (maybe Llandrwyd as in Llandrwydno? Llandrwydno is Llandudno’s old name: Llandrwydno = church of St. Trwydno). tnzyl might be an anagram of Llyzn t ? Unclear. tnzyl alab hrb llandrwyd
But: if the phrase is backwards word order or anagram… "tnzyl alab hrb llandrwyd" reversed (characters): dywrdnall brh bala lyznt → still gibberish. If tnzyl is Atbash: tnzyl → g m a b o → gmabo (nonsense)