It is possible to redeploy artifacts when Deployment Policy is set to "Disable redeploy". This only happens when the artifact has no maven group.
Steps to reproduce:
1) Create a maven hosted repo with the following setting:
Layout Policy : Permissive
Deployment Policy: Disable redeploy.
2) Upload a file to
3) Upload again to the same path. This should not be allowed.
If a maven group is present in the path then the redeploy is prevented
Attempts to redeploy should be prevented.