coud it work via adapter like https://www.amazon.com/dp/B07YDH8KW9/ref=cm_sw_r_oth_api_i_AWYrFb90CY1WK e.g. from nano/nx also?
I have not looked at the diagrams in some time, but I am thinking the m.2 adapter requires key-E, and that the m.2 which is exposed is the key-M. I would bet it is difficult to get the PCIe wiring through to the outside if plugged into the key-M (for the Xavier dev kit case). Adapters like this also tend to cause a need for the PCIe data to slow down.
Assuming the card is using an external supply (it looks like it has a connector for this), then I see no logical reason it wouldn’t work…but you’d probably have to risk buying one to know for sure.