Why doesn't xattr -dr work for removing quarantine?

I have a self-written installer with a shell command for removing the quarantine flag with xattr. Got a screenshot from a user showing that this doesn’t work:

Does anyone have an idea what I’m doing wrong?

Read the manual?

-d needs name of item to delete.

you may need -c to clear all.

Obviously, the brain is getting too old. Thanks.

Nope - Apple’s Stupid Interruption Protocol (SIP) is causing frustration focal dystopia and we go stupid with rage, not age :D.