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Ah, I haven't been aware of usage of phrygian mode in metal music. Maybe that's what skews the ratio of Emaj/Emin towards the latter?

The author notes that the analysis is based on 1300 songs from the Billboard top 100 in the last 2 years.

I think it's safe to say the effect of metal songs using phrygian is negligible.

And the phrygian used in metal has modified major third (G# instead of G) which, again, results in E major, not E minor chord.