Hide or prevent?

Hello, I have a client who has a problem that this plugin could potentially solve, but not if the hidden modules still render in the page code. I’ve read reviews, support threads and the plugin description text and can’t deduce whether this plugin simply hides modules via CSS (so that their content is still accessible in source but obscured from the page render) or prevents the module loading entirely. The solution I need really has to be the latter, so could somebody please confirm.
Thanks