You're right. I must have missed the USB 3.1 in the specs of the unit you linked. I mistakenly thought you only linked USB 3.0 units,for some reason.

Yes, Fantec and Mediasonic seem to be the same device. Fantec is relatively popular here. It's a German company that used to make cheap HDD enclosures back int he days, now making slightly more high-end stuff.

The best I could find are these two units then, both 10Gbps USB 3.1, which I am loosely considering "thunderbolt 3.0", but no, none of them are, as you point out.

So it seems Thunderbold 3.0 is currently only being used for external video cards.
But, after all, 10Gbps seems to be enough to accommodate mechanical drives, in terms of bandwidth right? Bottleneck is at the drives even with "only" 10Gbps USB 3.1. Right?