Cantesito yeah that's because it's a 3 years old post, things have changed a bit
Where are mods stored?
Mods/custom maps are in %localappdata%/Plutonium\storage\t4\mods
They can also be in localappdata%\Activision\CoDWaW\mods if you ran exe setups
If you want to uninstall some simply remove the corresponding folder
If you want to move the mods to another drive to save space on your main drive you can read our documentation https://plutonium.pw/docs/modding/moving-to-another-drive/