I think it would be mostly the same, but I havent used this setup for awhile now. There may be changes in Windows 2009 ,20H2, or newer MacOS which may have affected things. Best advice I can give is to try what Ive outlined first, then keep looking around if you still have issues getting it working.
For everyone else with this setup, the above didn't work for me.
I started again installing a clean Windows 10 (1903) (offline installation), disabled Windows Update using GroupPolicies and then followed the instructions for BootCampDrivers.com (video). In the end I disabled some PCIe ports and reboot with Flight Mode on and eGPU plugged in as suggested here (video). Works like a charm, no fiddling around with pci.sys etc..