Why do you feel this is a WTF?
Because it's taken them years to do it. And their stuff is notoriously difficult to get hold of direct from China for some, presumably deliberate, reason.
Maybe I should have said "That's an interesting development..."
Their email came with the fine print:
All promotions are valid worldwide EXCEPT China, Japan, Europe, the USA, Canada, and Mexico. Limitations and restrictions apply. RIGOL Technologies reserve the rights to change, amend, modify, suspend, continue or terminate all or any part of the promotion at any time without notice.
Which is no doubt to appease their distributors. No love for Emona though, it would seem.