"Yeti Blue Microphone is not being recognized" and "Static/garbled issues with Yeti Blue Microphone"

So I'm going to answer my own question, but this puts it out there for other folks :)

I had two problems with the Blue Yeti:

1. Periodically after moving to Big Sur, several times a day during webcasts, the microphone would become "static-y" or garbled. I know this wasn't the microphone because it continued with a replacement. The weird part is that if I started another app on the microphone at the same time, like voice memo, the issue went away. If I paused voice memo, the issue came right back! That told me I had a driver problem somewhere.
2. Blue Microphones (Logitech) asked me to uninstall G Hub. Now, G Hub does work in Big Sur (for the most part) even though this community post says there are incompatibilities: Blue Yeti X and MacOS Big Sur (https://discussions.apple.com/thread/252908984). Uninstalling it didn't help, in fact it made it worse because then the microphone isn't seen at all. Which matches this community post: Yeti Blue Microphone is not being recognized (https://discussions.apple.com/thread/253093409)

Just for the record I didn't want G Hub anyways, I thought it might fix some problems. But it only recognizes one of my multiple Brio cameras. Use the "Webcam Settings" app, it will do what you want for webcams.

So back to that problem about it not being recognized. Most folks didn't look past the Audio devices in preferences to see if it was there. And it didn't show up under Audio in "System Information" either. But if you looked carefully, it did show up on the USB bus!

So that go me thinking, and I mapped the USB device through into a virtual computer, and it showed up as an audio device. Whoa. So the problem must be an audio driver on my computer.

Blue Microphones kicked my problem up to a higher level two weeks ago, I haven't heard a thing back since :)

=== THE FIX ===

So knowing that it had to be some kind of problem in the audio system, I ran down the issue myself and it was a simple fix. Only after several days digging and looking at the console, etc. Both of my problems were caused by the same kernel extension: /Library/Extensions/logi_audio_override.kext.

Apparently this extension has some issues with audio subsystem in Big Sur. After I got it cleaned out, my microphone popped up as an audio device, and I've been using it for three days straight without any static.

Blue Microphone's instructions to uninstall G Hub where to delete the folder in /Applications, disconnect the microphone, and remove Users/Shared/.logishrd/LGHUB, Users/Shared/LGHUB, /Library/Audio/Plug-Ins/HAL/LogiGamingAudio.driver​​, and ~/Library/Application Support/lghub. Then I'm adding don't forget to remove the kernel extension above too. Reboot and plug the microphone back in, it should work fine.