Module content type not removed after uninstall
You shall have to uninstall the module to get the type deleted automatically.  Just disabling it will not remove anything.  Deleting the module after disabling it - without uninstalling it first - is not a good idea.

After disabling the module, click on the “uninstall” tab at the top of the modules page and check the module you want to uninstall, then click the "Uninstall" button.