No.  Username was not changed.  I ended up opening a ticket with support.  What I was told was, "...this is a check that makes sure you are not using "administrator[NAME]" on the PSC" and as long as I wasn't using that account for the PSC I was okay.  I wasn't so, I proceeded with the upgrade and was successful.
Hello. I'm getting a warning on the upgrade pre-check that says: " . Management username contains Administrator."  Since it's a warning, I'm fairly certain I can proceed through it, but I'd like to know why it's throwing this warning.  Don't remember any warning like that when I installed it. Thank you.
VXRail update to version 7.0.132-26894200. Pre-check warning