When you go to delete a multibranch folder that is using Github as a branch source - you will see a message "delete repository". 

This is usually alarming as the access token used often has permissions to actually do this, but this is not the intent. 

This is due to the Pronoun for GithubSCMSource being "Repository". 

see https://github.com/jenkinsci/github-branch-source-plugin/blob/github-branch-source-2.4.1/src/main/java/org/jenkinsci/plugins/github_branch_source/GitHubSCMSource.java#L544

and the wording: https://github.com/jenkinsci/github-branch-source-plugin/blob/github-branch-source-2.4.1/src/main/resources/org/jenkinsci/plugins/github_branch_source/Messages.properties#L40

This is then used in https://github.com/jenkinsci/cloudbees-folder-plugin/blob/cloudbees-folder-6.7/src/main/resources/com/cloudbees/hudson/plugins/folder/AbstractFolder/tasks-new.properties

which ends up with the scary looking: