Indeed, you are right. The product was priced in USD and so, we should only get an USD refund.
However, they always promised, several times here in the forum, that if refunds where to happen, they would have been of the original BTC amount.
Also, when an user of this forum went to visit them one week ago, they repeated that point. If refunds where to happen, they would have been for the original BTC amount.
So, while i completely agree with you that we are not gonna see BTC refunds, i'm awaiting for when they will issue USD refunds and they will have lied another time.
Now since the only payment option is in BTC Will I get the same ammount of BTC back should you fail to deliver by December 31st?
Orders are taken in BTC, in the unlikely event we get to refunds they will be given in BTC.
HashFast has completed logical and physical design, paid their NRE, taped-out a very complex chip in record-breaking time (over a month ago), and expects their TMSC wafers to be done next week.
Cointerra might have done some of those things, but we don't know. In any case, Cointerra's chips won't be here for another two months, at best.
To summarize for the TL;DR crowd:
HashFast - chips done next week
Dear HF, Cointerra didn't ask 15$/GH for an October delivery. They are asking 3$/GH. Can you spot the difference? You lied knowing what you where doing, they are simply late.