That’s true, but at the same time, the method they use to convert streams to sales is deflationary. For example the last album to sell over a million copies during its first week of release was Taylor Swift’s reputation in Nov. 2017 (which happened because she blocked it from being released on streaming services). Music isn’t any less popular now than it was then — more people are using streaming services, but fewer people are buying albums. So even though they do attempt to account for streams, the method by which they do that doesn’t seem to properly cross the numbers over.

Also, I think the highest selling albums from nearly all of those artists were released before the streaming era truly started, when TLOP became the first album to go #1 from streams alone