As brudgers pointed out it's just how a chord progression is defined. A G major chord for example is G/B/D, if you don't have the B it's no longer considered a

As brudgers pointed out it's just how a chord progression is defined. A G major chord for example is G/B/D, if you don't have the B it's no longer considered a chord in music theory and if you don't have a chord you can't have a chord progression really. I don't really listen to this type of music but based on the quick snippets that were played only blitzkrieg bop had a chord progression. The other songs were power chords or what sounded like just single notes being played. If other songs in this genre you've heard are playing full bar chords than those would likely be considered to have a chord progression. Also, since most of this discussion, including the video, was around guitar, you can have a chord progressions with one person playing only power chords but someone else has to fill in the gap, like the bass or singer. It's over the whole arrangement not an individual part.