The claims of Cyberpunk being the fastest selling game were baed entirely on pre-orders which tells you basically nothing about the quality of the game. Sony followed up by removing the game from their store and Microsoft added a quality warning to their store in an almost unprecedented move. Microsoft, Sony and Gamestop all offered refunds. It's a nice claim, but it's pretty irrelevant to what actually happened.

They had 8m preorders. 13m in 10 days takes into account refunds and returns. They are sitting at >10 million copies on Steam alone right now. Its quite possible they made their 2021 goal of selling 20 million copies at this point, less than a month after release.

Where was Sony and Microsoft when Remedy released Control running at 10fps on PS4 and Xbox One?