Game bugged out. Tried to fix it, now it crashes on launch.

I've been playing it without any issues for the past week, but this morning when launching it I had the "Sims Delivery Error 0008" popup, along with the "WWWWWWWWWWWW" household bug, making me permanently stuck in the Main menu.

I couldn't load old saves NOR start a new game/enter CAS.
Doing either gave another error-popup saying something about my files being corrupted, sending me back to the main menu.

Note:
- I use both EA and Steam as I've bought DLC's on both, but I've had no issues like this before.
- I currently have no CC/mods installed, mod folder is empty, mods are turned off in settings.

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I GOOGLED AND FOUND:
- "The 'Sims Delivery Error' is usually caused by outdated mods, game file issues or your antivirus blocking stuff."

- "The 'WWWWWWWW' glitch is most often caused by having no active household, which can be fixed by playing and saving an existing family. If the glitch persists, especially after a game update, it could be a corrupt save file, a mod or custom content (CC) conflict, or a need to clear the game cache."

I CAN CONFIRM:
- Yes, I saved my last game without playing a household, as I saved a build I was building in world management. This is probably what caused the "WWWWWWW" bug.

- CC/mods are not the issue. 
- I haven't changed any antivirus settings lately so it shouldn't be the cause?

THE FIXES I'VE TRIED:
- Clearing the cache on EA.
- "App recovery" on EA.
- Repairing the files on steam; it found nothing to repair.
- Removing "localthumbcache.package".
- Uninstalling + reinstalling the game on Steam.
-  Deleting "D:\SteamLibrary\steamapps\common\The Sims 4".

Doing all this has resulted in my newly reinstalled game crashing on launch before even entering the main menu, and "Verify integrity of game files" does nothing, as there are no files in need of reparation (again).

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I posted this on Reddit and Steams discussion over an hour ago with no replies, so I'm posting it in other places while still trying to fix it.

In this past hour I've also:
- Uninstalled Sims 4 on Steam (again).
- Uninstalled EA's app.
- Successfully removed all Sims related files on my PC (steam library, program files, etc).
- Reinstalled both apps
- Ran an "app recovery" on EA.
- Verified integrity on Steam (No issues pop up!).

The game still crashes on launch.
The sims 4 intro starts, sound and all, and then the screen flashes white before shutting down.

EA's popup says:
"Failed to launch game - An error on our end caused the launch to fail, try again a little later".

So what do I do now?
Is this truly all caused by an issue on EA's end? Did I do all this for nothing?
I'm so confused and frustrated I can't even think of other solutions. Brain feels like mush.

Any comments, ideas, questions are appreciated.
Brainstorm with me if you want, I'm open for all suggestions at this point.