WindowsApps Folder requiring permission

[tenjiFPS]

Hello,
so today I realised that there are still two folders (37gb) on my m.2 SSD in the WindowsApp Folder which I can't delete. Both are probably Dirt 5 which I installed and shortly after uninstalled again using the Xbox App for PC. 
I had this problem before where I removed a Windows Store Game but the folder was still in my WindowsApps folder, sadly I don't know how I managed it to delete it back then.

Everytime I try to delete the folders an error pops up "You require permission from MARV-PC\mar-m to make changes to this folder" which is the account I'm using and also the only one on my PC. 
I already tried giving permissions and access to every user there is (only me) and also tried the Take Ownership registry hack but still no success.

70gb on a 500 SSD is quite much so I would be very glad if one of you could help me out!

[Roswell]

If you're having issues with traditional methods, just go ahead and make a Ubuntu bootable USB drive and mount/delete it that way.