Speaking entire hypothetically: It's a dick move to remove primary developers from credits in an update, especially when an update includes hundreds of fixes that were provided by those developers that stayed out of players' hands for years.

Fans quickly noticed how the port team 'Grove Street Games' had been dropped from the trilogy's splash screen and now the developer's CEO Thomas Williamson has responded on social media. It's worth noting Grove Street is still in the game's end credits, but the fact is the screen referencing GSG on launch is now gone.

Rockstar Games has released updates for each of the remastered Grand Theft Auto games included in the GTA Trilogy Definitive Edition collection that make these maligned versions play better, as well as making them look more like the original games released on PS2 back in the early 2000s.