If this guy is going for reducing transients on the ladder rack I can see wanting to go back to the grounding electrode (star wired ground system) but I think the wire size may be excessive. These days noise rejection is a lot better in IT equipment than it was in the 70s but a lot of people have not adjusted their thinking.
There is more urban legend in IT than any other industry I can think of. A lot of these <overkill> grounding practices have simply taken on a life of their own and no amount of logic will get people to budge.
