If graphite would help, we'd do it in an instant!
I think you mised it- the article was saying that the joint replacement interacted with the biddy to produce its own graphite lubing. This was a discovery, not a design feature. They didn't expect this at all.
It just means that signing in blood is now equivalent to using a #2 pencil

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.