Welp, I saved the logs and then proceeded to uninstall VIVE Wireless which wiped the logs I saved (inside the install directory). oof. I have only the output of SystemInfo which shows that my card was present.
I saw people had the same issue on the update from 1.20181102.0 so my guess is a bug in the VIVE Wireless Updater. They all said the solution was to physically switch PCI slots, which would indicate Windows still remembered something about the device.
Anyway... I asked someone in VRChat and they told me exactly to fix it without switching PCI slots, so I will post the steps I took here in case other people encounter the problem:
Uninstall VIVE Wireless
Start Device Manager with the set devmgr_show_nonpresent_devices=1 variable set. For detailed steps how to do this, even on Windows 10,8 or 7, follow specifically the Windows 7 steps from here: https://support.microsoft.com/en-us/help/315539/device-manager-does-not-display-devices-that-are-not-connected
Right click the Network Controller with a yellow exclamation triangle and choose Uninstall Device. If you have multiple Network Controllers, you can use the attached picture below as a reference image to compare Hardware Ids and make sure you choose the correct one. You should also see the word "iwigig" show up in the Events tab.
Install VIVE Wireless
This brought back the Intel WiGig device for me!!! I just tested and I was able to successfully connect to the headset while on version 1.20190410.0
, I will send you what little log info I do have. Again really sorry it didn't occur to me that uninstall would wipe the logs.