The transaction is indeed confirmed and received by the owner of this address.
Unfortunately, i believe that you got scammed. Most .onion sites (especially those who sell stuff) are scam
Edit:
Just checked the site. While it doesn't instantly raise red flags, i still believe that this is scam.
If you, at any time in the future, want to buy something on a .onion site, make sure to only use 'reputable' (at least as reputable a marketplace on the darknet can be) marketplaces, from a seller with a good reputation.
According to their site, they use stolen credit cards to buy these products (which are already bought and stored in their warehouse).
IMO, it doesn't make sense to sell them at a discount, since they already have been bought and shipped (at least that's what they claim).
They could easily sell them for the normal price, if that would be true.
I am sorry for your loss
This place is full of di**heads