He has never moved a lot. Just walking around even in 80s and 90s. So its not that different.Rob is absolutely using backing track support and live autotune. That said, he still sounds great for being 74.
The onstage lack of movement is a bit lame, but again: he's 74.
If you've never seen Judas Priest live: go see them while you can.
The Andy Sneap mixed stream is tuned in post. It is thus not "live auto tuned". Neatly and subtly tuned, but evident if you have an ear for it. Can't say I've spotted anything out of the PA.Rob is absolutely using backing track support and live autotune.