Thanks for the replies guys.
Kind of varying reports, just like everything else I can find.
I think I'll tell him to skip the annealing and just watch the necks.
My brother reloaded nickel for his '06 for a few years and no signs of cracking or flaking yet, but that rifle's become a "safe sentry" so doubt the brass will see a fourth reload.
This is the annealer I copied:
https://youtu.be/k0xE-6bSwME
Running the 750° and 450° Tempilaq on the neck and body every 20th round or so, so should be good temp wise.
So far really happy with it.