Actually, they are not reading the law correctly. It's illegal for anyone to send pipe tobacco to a Washington state residence, period, regardless if they are in the state or not. It's also illegal for you to place an order asking them to ship to a Washington state residence, period, regardless if the shipper would be in the state or not.
(I am the Seattle Pipe Club Political Liaison, and led the unsuccessful effort to have the law amended in this current legislative session.)
If you like, I can provide more direct links, but here is some info...
I never updated the page to tell folks that the effort was dead...
I would recommend considering Tacoma Tins, they have a great selection, and Rick and Roxi are great people.
They are a retail store.