Sorry if I didn't express myself clearly enough. I did not mean to suggest that the hornpipe in the Deb Chalmers clip was in any way reminiscent of a polska. I was referring to 3/2 hornpipes, which can be somewhat similar to the 'semiquaver' polskas, which are played in an even 3/4 metre (not only slängpolskas or Finnish polskas - although perhaps the 'straight' kind are more common in the Finnish repertoire). Of course, there are stylistic and structural differences that mark them out as being either a 3/2 hornpipe or a polska. But I am reminded of this tune
https://thesession.org/tunes/7962 , written by Northumbrian piper Andy May, who was playing in a band with Finnish musicians; he had set out to compose a 3/2 hornpipe (a staple of the Northumbrian piping repertoire) but his Finnish colleagues informed him that he had just composed a very nice Finnish polska!