Woocommerce product rewrite rules not working

I am trying to change the default structure of the woocommerce product url to include the author username.
The default url for woocommerce products in my installation is as so:

I want to change it to something like this:

This is the code that I have so far:

However when I visit the product page for any product it still resolves to the default woocommerce
permalink structure. I made sure to flush the permalinks in my code so I have no idea what the issue is.