I don't think Jim ever denied Irish trad singers use ornamentation.

In fact the first time I ever heard the term ornate applied to singing was from Peggy Seeger.

Her and Ewan were following Sean Cannon who had just sung a version of Blackwaterside unaccompanied This was pre Dubs, about the time of the curry wagon.

Anyway Peggy describes Sean's singing style as very ornate.
I know I'been thinking I liked Tommy Dempsey's more straightforward version better. And Bert Jansch's (complete with folk baroque guitar) better than both of the Irish versions.