"chipset does not support UEFI VBIOS graphic card"

Hi. This is an ASUS FAQ page:
[Motherboard] When I use the integrated graphics card on the Intel(R) 500 series motherboard , why does the CSM option under BIOS appear gray and non-configurable? | Official Support | ASUS UK
I've bought an ASUS B560M mobo and, because I don't have need of a graphics card, my BIOS has the CSM greyed out. I need CSM if my bootable USB stick for Tails is to work.

Firstly, I don't understand the statement "The Intel® 500 series chipset does not support UEFI VBIOS graphic card". Surely that should read "The Intel® 500 series chipset ONLY supports UEFI VBIOS graphic card" no?

Anyway, my main question is: if I go shopping for a different mobo (not a 560 series) how can I be sure that the BIOS will have an enabled CSM? Product pages don't tend to be that specific, I'm finding.

Thank you. Winver 21H2

I'd be sending this one back, though...