I'm checking R7 bios updates to see if dell have added support for 9th gen Intel cpu yet, and these come across my attention:
Alienware Aurora R7 System BIOS
- Enhanced Thunderbolt PCIE add-on card support.
Yes, it seems Dell often confuses Thunderbolt-3 and USB-v3.1 because they share a the USB-C port type.
However, if you can find the Thunderbolt interface-header on the motherboard, and the special Thunderbolt-card that goes into the machine, please let us know. I'm sure there are many Aurora-R7 owners that would love to know and buy one.