One thing that jumped out at me was the data point suggesting there are very few power chords in electronic music. But in fact, they're ubiquitous because it's easy to make a power chord in a single note, by tuning oscillators a 5th apart. Any synth with 2 or more oscillators comes with a bunch of 5th patches (or patch sheets if it's all analog). It's one of the first synthesis techniques people learn to make thick-soundings patches.

Also the whole idea of doing the analysis based on absolute rather than relative notes makes little sense to me as a musician, though perhaps that's because I didn't start with guitar or a tuned instrument like a trumpet.