Now developers don't really need the writer's advice.
Recently, writer Andrzej Sapkowski held another presentation of the book "The Tower of Swallows". During the event, he spoke about how cooperation with CD Projekt RED, the developers of games based on The Witcher franchise, is structured.
The creator was pleased with the new deal:
The contracts between me and the developers are excellent now. I hope they stay that way. CDPR very rarely [asks me for help]
Andrzej Sapkowski was more involved in the development of the first parts of The Witcher: specialists from CDPR often turned to the writer for advice and additional information about the world of "The Witcher". Now everything is different and he is happy about it.