It’ll be compatible with 5 Gbps devices, but if you’re intentionally looking to restrict even 10 Gbps devices down to 5 Gbps for some reason, you might be able to find something in your BIOS that lets you do that, or you can get a USB 3.0 extension cable that’ll limit your speeds to 5 Gbps.
Genuine Intel 0000 means it’s an engineering sample. I would guess this is some sort of preproduction/production sample Thinkpad with that in mind.