Is it counterpoint or polymetric

It's not really polymetric, although the rhythm and the melody stress different parts of the beats. The bass follows along with that recurring rhythm that starts off the song, which has a 3 + 3 + 2 beat pattern, although that's really just 2 bars of 4/4. The melodies seem to be in 4 beat phrases. Every once in a while, they put in an extra measure of 3/4 or something, or pickup to a measure on an offbeat, so that will through you off if you don't know all the variations - although the whole band plays those together, so it doesn't put anything out of sync or anything like that..