Not sure what your point is, Jack? The rhythm thing is applicable to all dance music, and yes, there is an important swing in the belly music that is perfect for the hip swing in the dance itself, and (as ever) mess that up and it becomes just another flat pub session tune.
But both of the counter examples you offer have the *phrygian b9, characteristic of this genre of music. Am I missing something? Are you saying that eg Nellie the elephant played with the right swing would do?
*play is
not all that hard on melodeon! It is 3rd mode of our diatonic scale. So start tune on tonic B using G row, or tonic F# on D row. cross fingering makes things easier. You will end up dotting in the odd Eb (in B) or Bb (in F#) as these scales are ambiguous wrt major/minor
Major "lead in advert" (a new record)alert on that dailymotion link!! Click at your peril ...