This is indeed the case, as per the ending of the campaign on March 9th, they stopped accepting refund requests per the 11th of March.
They have been more than generous after all the potential shortcomings and feature implementation have come out and been documented and described, on Indiegogo, Facebook, this forum, etc. If after all this time someone still hadn’t made up their mind and cancelled, about the only thing left to do is wait for it to be delivered and then sell it yourself.
Those who got a defective unit will have a replacement sent under warranty once the return procedure is requested and completed.