@lcsmd Thank you for reporting back on how to get it working. When adding it to the wiki I figured out it uses the “ASIX AX88179” chip and we had some of the Startech devices listed in the “Notes” column already. So I added your USB31000SPTB to that list as well to be found by others - including the hint to use a different iPXE binary.
I have to say the list is not really up to date. Mainly the notes are not because it’s a lot of work to keep it up with information from forum posts only. Nor do we have time and resources to test all the hardware ourselves.