If UOKiK got some reports from customers that something is potentially working against customers, then an investigation is started. This is not an exceptional case of CDPR that's under radar. It happens tons of times: Misleading labels, incorrect ingredients on some food, something is overpriced etc. And this is wonderful, as it is one of organization that can actually force a positive change.
But, 10% is a maximum penalty posted. For the instance [1] shows that in 2018 maximum penalty was 931k PLN (~300k $).
Another case [2] shows that penalty can be easily deceased if subject is cooperating (-50%) and further more decreased if subject takes penalty without court.
At the moment CDPR has done something extraordinary that is: extended refund policy for the title. Forcing that also on PlayStation (and taking ricochet by pulling title from the store). Providing a few hot fixes for very very fresh product and stating future work in next couple of months.
I do understand that players on base PS4 and XBOX are mad. And in my opinion UOKiK can help taking their side. But with such a complicated case, where lots of players do play and enjoy the game (even on these consoles). The 10% penalty is simply impossible. Also I don't know if it's is at all, as there is the refund policy in place.
[1] - https://www.uokik.gov.pl/download.php?plik=24030
[2] - https://www.wiadomoscihandlowe.pl/artykul/uokik-pol-miliona-...
TL;DR; UOKiK does that as requested and expected from them, but is very unlikely that 10% penalty will take place.