It seems a little shady though because he says he has another one available, but the pictures on both listings are the same. If you zoom in, you can see that both sets of pictures are indeed of the same coin, since the first bits are the same.
He told you it was sold hoping that would cause you, a potential buyer, to panic buy it at 50k
Perhaps. It's also shady because, as I said above, the pictures on both listings are the same. He may have just been too lazy to take pictures of both coins, but I agree that something doesn't seem right.