That information is not correct. AdWords does not consider websites that use a Clickbank for checkout as a bridge page. Here is the official AdWords policy on Bridge pages:
Using Clickbank for the checkout is not your problem.
AdWords always send you an email when an ad or website landing page is disapproved that includes the policy that your ad or landing page violates. If you had an ad disapproved, why not share the reason stated for the disapproval? That would help us to help you.