IDK, Unreal Engine runs on Linux, can export to Linux, and the Unreal Tournament games are released on Linux.
I really don’t think he hates Linux, I believe him that he didn’t see a financial point in supporting it for their games. People seem willing to use Windows to play their games, so there’s not a strong financial incentive to support another platform.
If you want Sweeney to change his mind, get more people to use Linux exclusively. Personally, I prefer to ignore him.