WPMU DEV Dashboard and X-Clients

Greetings,

I have a client that will be leaving my services. I have built their site using several WPMU Plugins. However with them leaving I would like to disallow them from using anything that isn't already installed on their system. As such I have signout out of WPMU-Dev in their administrative area.

This will disallow them from updating all WPMU plugins correct? But it will NOT stop them from using the ones that are already installed?