Hacker News Reader

It says that Apple agreed that they improve clarity for review guideline and reject reason, and report improvement to JFTC.

Also it seems that "single" link isn't mentioned.

Also says that developers will not be prevented from converting existing apps to "reader" apps, or submitting brand new "reader" apps.

Further, "reader" app appears to be defined as "an app used solely for the viewing, etc. of digital content users purchase through websites, etc."