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Well I can guarantee it's going to work even if those USB HDDs are USB 2.0 in their controllers.
Check the links of those reporting bugs, at least one reported hard drives failing intermittently... essentially the same bug.
What do you get for your £230 (not £300)?
Every device is connected to a USB 3.0 hub, an external sound card that can drive high ohm headphones and has an optical output, 5 USB-A connectors, 3 USB-C connectors, the power to the hub also powers the laptop (rid yourself of another cable), an SD card reader, a DisplayPort plug... and one very clean desk.
Basically... this isn't an adapter so much as it's a mini-computer providing a full Mac dock in a single cable to your Mac... and anything you attach to it will work even if Apple don't fix their USB 2.0 Catalina bug.
I wish I'd bought this from the outset... because I did buy an £80 one (the StarTech), and an Apple SD Card reader... and was only £100 off the price of this, which was then additionally wasted trying to debug the issue I found.
For £300 odd? What makes it better than a £80 one? All I need is to hook up a few usb hdd’s