How do you lay eco cork foam underlayment?

How do you lay eco cork foam underlayment?

https://www.youtube.com/watch?v=KtXQHTNIYCM

Is cork underlayment a vapor barrier?

The addition of a vapor barrier to this cork underlayment makes it one of the most innovative underlayments on the market. The unique design of this underlayment allows air to flow naturally between the subfloor and underlayment, which helps to prevent the growth of mold and mildew.