In the comments from the above (you'll find similar in other comments, and on Reddit & YouTube). The Harddrive inside is a WD100EMAZ (WD Red 10TB), which currently retails for £318.68 https://www.amazon.co.uk/Red-10TB-3-5-SATA-5400rpm/dp/B07194...
It's even running the same firmware. It makes no sense, the only logic I see is that customers are willing to pay more for the 'enhanced features'. If you look into this, you'll find no manufacture states the read and write speeds of their USB drives, making it a little harder to compare, so there is a little luck of the draw in what you actually get. Seagate are similar: https://www.reddit.com/r/DataHoarder/comments/8thr34/seagate...