There are all kinds of nasty little things in that refund agreement.
It is further understood and agreed that the general release referred to in Section 1 above a are a full and final release and shall apply to all unknown and unanticipated Claims, including, without limitation, those resulting from or based upon or in any way connected with the matters referred to herein as well as those now known or disclosed. Buyer hereby agrees that all rights under Section 1542 of the California Civil Code are hereby waived. Such section reads as follows: A general release does not extend to claims which a creditor does not know of or suspect to exist in his favor at the time of executing the release which if known by him must have materially affected his settlement with the debtor.
What's this, HashFast is asking you to waive your rights? They wouldn't do such a thing.
The release as written will mean that should you suspect you're owed a BTC refund but choose to get the USD refund anyway, you will have no recourse at a later time should it become apparent that HashFast does in fact owe you your Bitcoins back as originally promised.
It is certainly incredible they would even offer that form publicly. It is nothing short of ridiculous. It only seems to be a 5 page agreement to screw the customer and indemnify (sp?) HashFast.
I am curious as to the date when the PDF was drawn up...

Edit: Ah, their lawyer made it, figures.
https://bitcointalk.org/index.php?topic=392977.msg4248560#msg4248560Looks like Cedivad may have gotten his full BTC back.