Enevhar Aldarion
Hero
You got me curious, so I looked up Timeless, the book just before the most recent one, and that book says that it was both a New York Times and USA Today best seller.
If something even cracks the top 50 or top 100, or however big the official list is, even for one week, it can be called that. More important is how high on the list it got and how many weeks it stayed on the list. For example, Timeless by Salvatore debuted at 14 on the NYT's hardcover fiction list on Sept 22, 2018. It also looks like the NYT only does a top 15 list now, so no clue where it went from there, other than down. And the sequel, Boundless did not even pop into the top 15 when it was released, but no clue if it would have been top 20 or top 50, etc, since the big charts seem to be a thing of the past. And I have no clue how to dive into Amazon's past to see how high they debuted there.