Thanks for everyone’s help.
Honestly, I think the device is just not made correctly.
I bought an ASUS TUF CU4K30 to see if I can replicate the issue with a different capture card and it doesn’t have this issue. It is always recognized correctly as USB 3.0 @ 5Gb/s. I’m using the exact same cables.
I guess it’s a non-issue then. Just don’t buy the Cloner Alliance Flint 4kP Pro.