Reviewing the error in the community, I found this: Provisioning Error + Nginx Config Test Failed
That led me to think the journaling was linking to the first sitename/folder.
So this worked:
$ vagrant ssh
vagrant$ sudo apt-get remote nginx nginx-common # removes all but configs
vagrant$ sudo apt-get purge nginx nginx-common # removes everything
vagrant$ sudo apt-get autoupdate # removes anything else related
vagrant$ exit
$ vagrant provision
Nginx reprovisions nginx and it starts up perfectly. YeeeHaw!