Well, that's what you get when you make your desktop computer so small that there's no room for the ports and internal expansion that some people need...looks like it adds half the size of the computer itself.
"10 Gbps" so not Thunderbolt - I'll pass.
Well - there's a horses-for-courses issue here: a 10Gbps or even 5Gbps USB 3.1 drive is perfectly good for Time Machine, music/movie/photo libraries etc. that free up space on your internal, super-fast drive - even when it is sharing that bandwidth with USB-A and SD slots etc. You don't even need to pay top dollar for the latest PCIe4x4 super-fast-flash SSD blade to go in it...
But I see key differences. First, it sits atop the Mini, second, there are no front face ports in view, and third, it appears to be an external SSD drive without servicing a hub or dock function.
...whereas, if you need optimum, uninterrupted speed and low latency for video editing etc. badly enough to pay the hefty premium for Thunderbolt (and a premium SSD stick to go with it) you're probably better off giving it a TB port all to itself.
...also, with Thunderbolt 3/4 we've got this weird position where TB3 devices use a TB-to-4xPCIe bridge internally and are better for NVMe drives or PCIe enclosures, while TB4/USB4 (TB4 is USB4 with a bunch of optional features made compulsory) devices tend to use tunnelled USB 3.2 from the host controller but can support 3 downstream TB ports, so they're more suited for hubs containing USB devices. Seems to be down to the Thunderbolt peripheral chips that Intel make - since TB4 doesn't offer faster speeds than TB3 I guess there was no need to replace the TB3-to-PCIe-type chips. Presumably this has all changed with TB5 which actually offers higher speeds than TB3.
You'll obviously pay more if you want one designed to stack with the Mac Mini rather than a generic one that sells to the much larger market of Mac laptop and PC users.I picked up this hub which is virtually the same for 22 bucks. You don't need to pay big bad prices for these types of product.