I don't know the backstory much but he seems like a colossal a**hole because he never believed in the success of the Witcher games and thinks that video games are stupid: https://www.reddit.com/r/gaming/comments/9kxeb8/cd_project_red_is_getting_sued_by_the_author_of/
Deus Ex (2000) - a game that pushes the boundaries of what the video game medium is capable of to a degree unmatched to this very day.