If this hasn't been solved yet, you can manually delete every single folder.
To find where it is, go to the game on ea play -> view properties -> show folder location.
You won't be able to delete it all at once. Just start deleting the game's folders one at a time until you can't anymore.
If any folder gives you trouble. delete the contents inside that folder, and then you can delete the parent folder.
This was the only way that I found to delete this Sims 4