They just made that up, or someone made something up somewhere. There's no USBIO support mentioned, just ttx4 system drivers added.
USBIO is a bit of a pig and not. They're USBHID devices, so they don't require a driver for the hardware to work, but they require a program to communicate with the device. All USBIO boards are not equal. It appears the hardware is equal, but the firmware which is on the FPGA is different for all games. So effectively there's a USBIO specific version per game. The only way you can tell them apart as far as i know, is the sticker on the sd card slot. Which is removed on most of the ones you see. Becuase they all have the exact same part numbers otherwise.
Then with different versions, some of those firmware don't even have close to enough digital inputs for a 1 player 6 button cab, they're a heap of analogue inputs and various custom stuff. The pinouts are different on all of them, and some of them in their current firmware state just wouldn't be able to be used for digital inputs. AFAIK no one has worked out or cares to work out how to dump and reprogram the firmware. The info and software to do it is freely available online, just look at the chip model, search it and you'll find the programming tools, but you need to have a clue because it's for smart people to do, not consumers.
Add to this, the only 2 that will work on Windows 10 (the rest only work on Windows

with their current firmware are the SF5 and Love Live USBIO revision. They just work when you plug them in. You can talk to the device as a USBHIB device
So if you're buying a USBIO, you have no idea what version game it's from or if it will work on Win 10 or not, unless it still has the sticker on the SD card slot(which most don't). Even if it does work on Windows 10, it's just a dormant device until you write a software application/dll to interface it.
Here's some info on how the hardware sends it's inputs
https://github.com/641i130/ttx4-usbio
If you want a version that works on Windows 10, sticker M9009153A - That's Love Live.
Feel free to correct any of the above if it's wrong.