Most of the listings have language like that in the eBay listing that OP had shared:
It's one hundred percent on the buyer to pay any tariff charges. The chances of recovery of any duties from the seller would be nil.
All of the Mavic Pro models weigh more than 250g. If this is first gen Mavic Pro, then it's a moot point because it didn't have the hardware to support RID without an external module.
Maybe it’s time for an expanded version of the Trust Test that you have to pass prior to purchasing a drone, along with the potential penalties for flying where and when you are not supposed to.
You’ll never prevent some idiots from breaking...