Apparently from what I read Google accidentally pushed the Verizon build number to a bunch of phones, which prompted the new install and changed the build number
If you look in the 9 to 5 Google link I shared in post no. 3 above, they've updated it with the following:
"Google issued the following statement this afternoon, and looks to have pulled the unintended OTA:
We’re sorry for the alert you received. Not to worry, we’ve resolved this issue and you can disregard it.
In a follow-up with us, the company said there should be “no” impact for people that have installed today’s OTA, and that a future update will return their device to the correct carrier build."