Does it conflict

Yes because otherwise you would get the message "product added to cart" on the next page view, which is bad UX 🤓

Have you seen this module? https://www.drupal.org/project/commerce_ajax_atc →

Absolutely. If you use that module I don't think you need this one.

This one is if you have a custom module for ajaxifying the cart, and need to get rid of the message on the next page load

Also, this module is much much older than that. So very happy that a more complete solution exist 🤓