Yes, that is correct. The builder module does not have output in admin area therefore built-in WHMCS message "There is no admin output for this module" is displayed.
The module only adds button "Open Site Builder" (or "Open [your-builder-name]") in client area to each product details page of hosting type. Please log in to some WHMCS client, open details of some hosting service and you will see this button in the right side menu box.