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Re:A No. 1 hit vanished from Poland’s charts – it’s not goin... by m463 on Tuesday May 26, 2020 @03:45AM (#23308449)
However since this is a NYT article, the NYT bestseller list may be relevant:

https://en.wikipedia.org/wiki/New_York_Times_Bestseller_List

In particular the first paragraph under Controversies

Re:A No. 1 hit vanished from Poland’s charts – it’s not goin... by 9935c101ab17a66 on Tuesday May 26, 2020 @05:21AM (#23308908)
Why? This source indicates that they never pretended that it was truly a literal representation of the number of books that were actually sold (https://books.google.ca/books?id=PEZkkbohbtoC&pg=PA290&redir...). And while you can argue they should reveal their methods, it's not disingenuous because it would be simply impossible to have an exact number of copies a book sold.
Re:A No. 1 hit vanished from Poland’s charts – it’s not goin... by m463 on Thursday May 28, 2020 @03:28PM (#23341408)
No that's what they said when pressed in court. (sort of like coca-cola in court coming out with "no consumer could reasonably be misled into thinking Vitaminwater was a healthy beverage")

It's just ironic that the NYT has an article about the polish chart... that behaves just like their book chart.