In this case the seller was a gold seller with 4 years trading, but the account was hacked and an unrelated
product was added to their products. The hacker was logged into the account and communicating with potential
buyers.
Sorry but I really don't buy that. Scammers will do anything to decoy you and point you in the wrong direction. I've been scammed on Ebay ~15 years ago on the purchase on a laptop, it's all the same red flags all over the place.
If something looks to good to be true, it usually is. A D3 will make a multitude of the seller's offer, no way he will let go of the miner for that price -> scam sign 1.
I feel your pain, you've just had an expensive learning lesson...