UK PDDP service to USA from Royal Mail

So, RM have officially announced their PDDP service from UK to USA

https://www.royalmail.com/usabusinessupdates

So, as someone who sells FBM from UK to USA, when using the new PDDP service, import duty, tariffs and import taxes (I’m assuming also state sales tax) will be billed back to the sender, and therefore we should incorporate all those items into the sale price as its the sender that pays them.

So, how do we get Amazon to stop Collecting state sales tax on our FBM sales from UK to USA, to avoid double tax collection.