It's a scam. The fact that the scammer posts a marketplace ad on Amazon or lists it on eBay (the original home of the fake SD scam) means less than nothing. Why do you think that the only places you can find them are places where anyone can place any ad they like, and that no reputable supplier offers them? If you believe this stuff then I can sell you Buckingham Palace for a good price.
But if you do buy this then please don't store anything important on it. It is a much smaller card that has been reprogrammed to tell the phone it is 2TB, so the phone will keep writing to it after it is full. This will overwrite the data on it, resulting in file corruption and data loss.
And yes, we've had people come here after buying these things. On testing they have always, without exception, been fakes.
