The release note suggests this is built-in supplier management rather than only support for a third-party extension. Check the admin product or supplier settings first; if the option is missing, confirm the installed version, user permissions, and whether the latest database upgrade completed successfully.

The category listing template likely uses the base product price instead of the logged-in customer group price. You may need to update the product-listing controller or template to call the same pricing logic used on the product page, then clear the application cache. Get complete information here on implementing group-based pricing consistently.