I'm wondering whether these "CD stats" include online purchases that are downloaded to a computer
If I understand you correctly, music downloaded to a computer is considered a download. Here is what the report says about them:
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Digital Downloads Revenues from digitally downloaded music were down 18% to $674 million in 2020. Permanent downloads of albums fell 13% by value to $320 million, and individual track sales were down 23% to $313 million in 2020. Downloads accounted for only 6% of total recorded music revenues in 2020.
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While download revenues are falling, they still managed to beat vinyl again this year.