The article explicitly says the firm arrived at its conclusions from Maiden data it saw. >Musicmetric noticed Iron Maiden's placement and ran its own analytics

The article explicitly says the firm arrived at its conclusions from Maiden data it saw. >Musicmetric noticed Iron Maiden's placement and ran its own analytics for the band. The firm wouldn't be the only one capable of drawing such conclusions. I find the piece to be OK and interesting if not exhaustive and airtight.