The full GTA V source code has been leaked The leak contains GTA V source code and stuff from Bully 2 and GTA VI Leaked in a discord server by a random British guy in the 360 modding community known to get sued by Rockstar multiple times
"Now i am expecting a open source version of gta to arrive soon on linux natively . Tired of playing supertuxcart."
Here is the source. Another one.
Linus is not an asshole, he's just right and tells his opinions straight without playing games. That's called honesty.
That... Sounds exactly like how every smart asshole describes themselves. Don't know anything about Linus, just basing that off your description.