How does the Bundle as a Product sync with Shopify POS?

Answer: On standard bundles? Yes.

First of all, let's get on the same page when we talk about Shopify POS. If you mean that you can sell a bundle via Shopify POS and the items' inventory should update, then we are on the same page. Fast Bundle is integrated with Shopify POS on Bundle as a Products that are selected to be added to the cart as one single item.

To know how to create a Bundle as a Product, please check this article or watch this tutorial video.