How to delete locked app on MacOS (Catalina)

I'm trying to delete a locked app on Catalina. In recovery mode, I disabled SIP, restarted and gave Terminal Full Disk Access.

Tried this:

/Volumes/Macintosh\ HD/Applications/Crashplan.app: Operation not permitted

And this:

xxxxxxxxxxxxxx:~ xxxxxxxxxx$ cd /Volumes/Macintosh\ HD/Applications/xxxxxxxxxxxxxx:Applications xxxxxxxxxx$ rm Crashplan.apprm: Crashplan.app: is a directory`

How do I resolve this problem?