This is a general question wondering that when you utilize the AMP stack especially in the industry of E-Commerce, you have the concept of an AMP product page. However, looking at all the examples online, the primary product data appears to be static and embedded in beforehand. Does this mean that the AMP pages were generated beforehand? If so, is this simply implemented by a script that creates AMP HTML pages for each product?
The example product page is here: Product Page
Not necessary. AMP has pretty enough tools to make dynamic and interactive pages. For example, you can combine amp-list with amp-state and amp-selector and get interactive products listing page
Read the documentation and do not afraid to experiment.