Can't remove systems folder from a faulty installation of Mac Catalina

I had Mojave installed on my late 2012 Mac mini, and attempted to install Catalina on it using the internet recovery mode. This install was made to the /Volumes/Local disc, and it failed miserably not allowing me to reboot properly. I was then able to go back to a Mojave installation, and continued with a successful install from an USB drive to the /Volumes/SSDdisc, and I'm now trying to cleanup the garbage from the other install. I've read and tried various tips and tricks like adding the terminal to have _Full Disc Access_ (I've added that to /bin/rm, /bin/zsh and /usr/local/bin/bash as well), and I've run csrutil disable multiple times from Recovery mode. I've also removed the ACL entry stating: 0: group:everyone deny delete from the folders. I'm still not able to remove the folders: Applications, System, Library, Volumes and Users. I've read, and tried the tips of these posts too, but to no avail: - https://apple.stackexchange.com/a/437604/146412 - https://apple.stackexchange.com/questions/361044/cant-delete-folder-operation-not-permitted - Not sure how to remove the rootless thingy on the one folder of mine which displays this, but even if System has this, I should be able to remove the others, right? The last attempt from terminal looked like this:

my-mac-mini:~ myuser$ sudo -s /bin/zsh
root@my-mac-mini ~ # cd /Volumes/Local
root@my-mac-mini Local # ls -ledO@ Applications System Users Library Volumes
drwxrwxrwx+ 2 root  admin  sunlnk     64 Feb 25 00:10 Applications
 0: user:myuser allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity
drwxrwxrwx  2 root  wheel  sunlnk     64 Mar 12 20:51 Library
drwxrwxrwx@ 3 root  wheel  restricted 96 Mar 12 20:51 System
	com.apple.rootless	 0 
drwxrwxrwx  2 root  admin  -          64 Mar 12 20:51 Users
drwxrwxrwx  2 root  wheel  hidden     64 Mar 12 21:16 Volumes
root@my-mac-mini Local # 
root@my-mac-mini Local # csrutil status                             
System Integrity Protection status: disabled.
root@my-mac-mini Local # 
root@my-mac-mini Local # chflags nohidden Volumes
root@my-mac-mini Local # chflags -R norestricted System
root@my-mac-mini Local # chflags nosunlink Library
root@my-mac-mini Local # chflags nosunlink Applications
root@my-mac-mini Local # ls -ledO@ Applications System Users Library Volumes
drwxrwxrwx+ 2 root  admin  - 64 Feb 25 00:10 Applications
 0: user:myuser allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity
drwxrwxrwx  2 root  wheel  - 64 Mar 12 20:51 Library
drwxrwxrwx@ 3 root  wheel  - 96 Mar 12 20:51 System
        com.apple.rootless       0
drwxrwxrwx  2 root  admin  - 64 Mar 12 20:51 Users
drwxrwxrwx  2 root  wheel  - 64 Mar 12 21:16 Volumes
root@my-mac-mini Local # rm -rf Applications System Volumes Library Users Volumes
rm: Applications: Operation not permitted
rm: System/Library/PreinstalledAssetsV2: Operation not permitted
rm: System/Library/Speech: Operation not permitted
rm: System/Library/AssetsV2: Operation not permitted
rm: System/Library/Assets: Operation not permitted
rm: System/Library/Caches: Operation not permitted
rm: System/Library: Directory not empty
rm: System: Directory not empty
rm: Volumes: Operation not permitted
rm: Library: Operation not permitted
rm: Users: Operation not permitted
rm: Volumes: Operation not permitted
root@my-mac-mini Local #

--- **So now I'm running out of options, and wonder if you're able to help me remove these folders (and the sub folders from System/Library)**