I was suspicious of this too. I don't think "genres" table is correct.

On Spotify, Blue Öyster Cult are listed as: ['album rock', 'classic rock', 'glam metal', 'hard rock', 'progressive rock', 'rock'] In the archive, they are just coming up as ['classic rock', 'hard rock']

Grimes: ['art pop', 'canadian electropop', 'grave wave', 'indietronica', 'metropopolis', 'neo-synthpop'] In the archive: ['art pop']

Taylor Swift: ['pop'] In the archive... nothing.