According to this website and this one, Minecraft has sold over 600 million copies. However, in a 2021 Gamespot article it says that only 238 million copies had been sold at that point. Have there really been sold 400 million copies in the last few years? Does this count double copies?
Minecraft has not sold 600 million copies
As far as I've been able to find, Microsoft has not released a new total or annual count of Minecraft sales since the 238 million figure. Comparing to past growth numbers however, The Verge reports that the game reached 100 million sales in 2016, and 200 million in 2020. Even if growth were accelerating, 400 million additional sales in two years would be unbelievable.
However digging into your sources, especially the one from Search Logistics, we find that the 600 million number comes from adding 400+ million downloads of a free version of Minecraft only available in China. Additionally, that version already surpassed 400 million downloads in 2020, rather than having explosive growth since 2021. It is reasonable that a free download would have higher numbers than the paid version; while Minecraft's 238 million sales tops charts of game sales, records for downloads of free games can exceed 1 billion.
In terms of the articles themselves, the Search Logistics page does include the claim "600 million copies sold" which I consider incorrect, but the rest of the page does include a breakdown between sales and downloads and the underlying data agrees with other sources such as Priori Data. The Game Rant page is much worse, inaccurately describing both the 200+ million sales and 400+ million downloads as "active players" and doesn't clearly state that the Chinese version is free.