Nope, I'd stay away from this 1070. I can't translate the image, but I don't know of *any* website offering a warranty on their own that will happily let you transfer it to another seller. And as for the manufacturer's warranty, if this had been an EVGA GPU, they're known for being flexible about warranties on used parts if you have the serial number. A lot of companies are not though.
I wouldn't put any value into this mystery warranty. I don't think the chances that anyone would ever honor it are very good, nor do I trust the condition from someone who may very well have been mining with it. I'd just get the 1060 new and save all this risk.