It worked for me just now.
root@lh:/var/discourse#` ./launcher run web_only "discourse disable_restore"`
Restore are now forbidden. Enable them with `enable_restore`
root@lh:/var/discourse# ./launcher run web_only "discourse enable_restore"
Restore are now permitted. Disable them with `disable_restore`
But maybe there’s something different in a web-only vs single-container solution. You might try
./launcher run app "su discourse discourse disable_restore"