The DT transcription, copied from that SCA site some eight years ago, is pretty poor; though criticism of it is probably most constructively made when sober and in full possession of ones wits. In those days all manner of misheard gibberish was added quite uncritically to the database. More careful and discerning these days, I think, but there's still an awful lot of junk that needs getting rid of if it can't be corrected.

Whoever wrote it (and whether Dan or Kitty was the original) it's obviously modern, and almost certainly set to the tune of By the Hush (Paddy's Lamentation); interestingly, that tune was found in Canada, not Ireland; although it seems to have started life as an American minstrel tune, The Happy Land of Canaan, an Irish antecedent isn't impossible; though I don't know of any evidence of one.