Dev currently doesn't configure katello's plugin settings with the enabled types, so for ostree, even if you set ostree to false, you'll see see OS tree repos in dev (and they'll fail to enable). This adds all the content types so dev looks more like prod setup.
Related issues
Bug #23925: Atomic repos show up for enabling even if ostree plugin is not installed
Added by Stephen Benjamin almost 6 years ago
fixes #23925 - match prod content type settings
Dev currently doesn't configure katello's plugin settings with the
enabled types, so for ostree, even if you set ostree to false, you'll
see see OS tree repos in dev (and they'll fail to enable). This adds
all the content types so dev looks more like prod setup.