I think the sound is just the tires. Looking at them, they're getting into the replacement zone on wear, and not being able to rotate them has probably taken them down a bit faster.
So, outside of the headache of the wait, looks like they knocked that repair out pretty satisfactory.
"Roads? Where we're going, we don't need roads." - Doc Brown
2012 Camaro 2LT RS, County Road 408, 20 miles south of Casper, Wyoming