I'm using this card (v3.0R black heatsink) and it does work in v6.10.0 and 6.10.1 using default settings, however I'm not getting full transfer speeds. Highest I can get is ~360Mb/s using m.2 (Windows machine) to m.2 cache (Seagate Ironwolf 510 960GB).
I also can't change the MTU value from the default 1500 to 9000 without causing a catastrophic error (upon rebooting the server) that results in the server to not boot anymore and have to restore the flash from backup. I assume the error is triggered by the lack of support for the card? I'm also pretty new to the Linux world so I'm slowly learning things as I come across them.