Confused about local user options

In the option tree there is an option for “Create local users?” and even with it set to no still seems to let me create local users. What is this supposed to do?

Also, I wasn’t 100% sure what “Allow blog admins to add users?” does. Does that allow them to add LDAP users only, or both? Does it relate to the “Create local users?” setting?

Lastly, under the add user menu and then in the “Add bulk user” section the sub-heading says “Local user creation is not available in bulk.” I don’t understand what else it would be doing if not creating local users.

Thanks

https://wordpress.org/plugins/wpmuldap/