Rotor replacement

A local mechanic/shop teacher told me that because the hub and new rotor are two pieces bound together I will have to get the new rotors cut to make sure that they are aligned (in plane) with the hub. Otherwise they could be too much runout and I'll get vibrating. What do you think about this.

I have not had that problem either. There is not a lot of meat in those rotors so I would not cut them unless you have a problem. I do not see a swedge on your rotors. You should be able to reuse the studs. Looks like you are good to go.