YouTube recording. Does your booklet say who wrote the lyrics? If you enter "s'i preut" into Google, the only pages you get are these lyrics. If you put only "preut", you'll find what it used to mean (English dictionary). "Preut" wasn't a verbal form AFAIK. Here is the meaning of "estraine" and here is the meaning of the verb "demener" (you'll find "demaine" only once in the corpus). What looks weird is "Au jardin mon père entrai": it needs a preposition, you can't have "In garden my father (I) went in/entered", you need "of": we don't have and never had the German genitive case "im Garten meineS VaterS in any Oïl dialect.