I would strongly disagree with this statement.
Any sort of prevailing torque nut cannot maintain a significant portion of their initial preload. See:
http://www.boltscience.com/pages/the-loosening-of-prevailing-torque-nuts.pdf
Furthermore, these nuts must be replaced with every use (or every few uses) to ensure proper performance. Metal locknuts can also damage the threads that they're spun onto, limiting the useful life of their associated fasteners.
Safety wire is more difficult to use than most other locking options and isn't strong enough to retain a significant amount of torque in the fastener. Put differently, there's no way a human is getting enough tension in the wire to support any appreciable torque in the fastener, and there's no way the wire would support that tension were it applied. And, frankly, if you've already put distorted nuts on there, the safety wire becomes redundant. I know that safety wire is used in practice, especially in the aerospace applications, but that doesn't make it the best solution for automotive applications.
Both lock nuts and safety wire are really 'loss prevention' solutions, not 'torque retention' solutions. They will do a good job of keeping the nut on the stud, but if any sort of motion occurs between the two parts being fastened then they won't hold the fastener preload very well, if at all.
It is worth noting that any locking technique isn't needed if relative motion between the two clamped parts never happens. Thus a vast majority of automotive fasteners need no locking in order to stay tight for an indefinite period of time.
Please don't take this as a personal attack, it's not. I would love to hear a sound technical argument as to why deformed nuts and safety wire would be the best solution, but lets skip the anecdotal evidence, there's plenty of that on both sides.