I've now heard back - they do cover the cost.
International orders are generally subject to local import duties and taxes (VAT). DigitalRev offers the convenience of shouldering these fees on your behalf by sending it via DDP (Duty Delivery Paid). This means that the sender is the one that pays any tax excise, not recipient. This means that the amount you pay on check out is the final and only amount you need to pay.
There are, in some rare occasions, that the courier may overlook this portion and ask you to pay for tax excise. When this happens, simply pay for it first and send us a copy of the paid tax excise receipt and we’ll help refund the paid amount back to your account. The terms and condition in which this feature does not apply is only to countries such as Saudi Arabia, Bahrain, Brunei , Russia and the Bahamas.