WAV, there is as much evidence, if not more, of chords being played than of any actual folk use of the recorder.
Cast your mind back to that pub you are so fond of picturing. The one by the river with the weeping willow and swans which glide majestically upon the silvery waters. Take your eyes off of that clog dancer for a moment, and put down your tankard of much-loved ale, I would like to draw your attention an object standing in the corner. Yes, a piano. Has nobody ever gathered round it to sing trad songs? CHords feature heavily in the use of the instrument.
So, if it was alright for them to gather round the piano in the pub and play chords, then why can't Dick Miles play chords on his concertinas?

"...if you want to carry on with it "Did you read it WAV or conveniently ignore it?Stu" is not perfect either. And, also above, you delight in a "poet" that makes no effort to use the traditional metre and/or rhyme that poets stuck to for centuries."

And which metre would that be? Iambic pentameter, trochee, catalectic, dactylic hexameter, elegaic distich, alliterative verse, accentual, accentual-syllabic, common meter, iambic, tetrameter,alexandrine, hendecasyllable, the list goes on and on..... There are dozens, if not hundreds of ways for a poem to work, WAV. There is no 'right' way, there is no 'wrong' way, it all depends on the poet, his skill and what he set out to do. An important part of any art form is knowing HOW TO BREAK THE RULES AND WHEN.