The trilogy looks unfinished , and i mean genuinely unfinished , it looks like it had another few months of work left before being released. My best guess is that GSG was expecting to release in 2022 after GTA V E&E , but when E&E got delayed rockstar wanted to release something in that timeframe , so they called up GSG and told them to finish the Remasters for release. Even though the mobile ports sucked they weren't as broken as these "remasters".
The main thing that sells this to me in my head is the fact songs they didn't have the rights to were in the files , it makes me think GSG thought there was time for rockstar to maybe get the rights for them , but when their release date jumped forward a few months they just did a dirty fix to the game so they wouldn't play and just didn't remove the song files. This also explains why hot coffee was still in the game files even though it caused a unending shit storm in 2004 , before September 9th , the remasters probably weren't far along , rockstar then gave GSG 2 months to finish all 3 games and so they cut corners , leaving hot coffee in , not proper testing , doing quick and dirty texture work just to get it working.
And rockstar said ok , remember that , someone at rockstar saw these remasters and said "Yeah that looks good".
Expect articles about how bad the crunch was and how GSG really wanted the game to be good.