I'm pretty sure the post you're replying to isn't talking about an iOS app, so IOKit doesn't have anything to do with it. They're saying that a store could install their own cell antenna to listen to nearby cell phones, record unique identifiers, and track customers that way. Apple is anonymizing MAC addresses to stop a similar form of tracking, but it won't work if there are other radio signals they can't anonymize.

Apologies if you knew that and I'm just not understanding your point.