Our branch open process pushes an empty commit to mark the beginning of the development process (we call them "versions") with a commit title like:

[ARCAD-Builder] ARCAD Build Commit [ci-skip]

There are no changes in the commit (intentionally) the commit id is just used as a marker to synchronize with our external build system.

The SCM Skip build is ignoring the commit message (the job runs) and we see this message in the Console Output:
SCM Skip: Changelog is empty!
 

That makes the SCM Skip plugin unusable for our purposes - interestingly enough the GitLab plugin also has a  [ci-skip] option - that option does work correctly for the exact same commit messages (without changes to the default regex) so it appears that the same code could be used/copied in this plugin to support "generic" skip regardless of git repo type.