Sounds like they were or are aware of a problem removing head bolts without twisting them off. I wonder if never seize is an equivalent of the motor oil and graphite. I would guess the motor oil was used to make the graphite stick to the bolts. If their factory would have used something, us in the field would not have had to worry about twisting off head bolts. Those center three are impossible to get at with a torch. I can remember a bolt or two not feeling good when I started to take it out. I used the torch to heat the block area of threads and removed the bolt with no problem.
I think I might try the never seize. I don't think I will be the one removing these heads in the future.