Apple's done nothing wrong, and given Apple's history of implementing these kinds of features, then opening them up to developers in the next release, being polite when asking them to open them up is appropriate.
For instance, it used to be that only Apple apps could control the brightness of the screen. Apple opened that up to all apps several years ago, and now many apps use it.
Apple's just introduced new technology that would be useful for this app developer, and in a way, they are effectively enabling this kind of app-- and when they open it up in the next release (possibly iOS 10, since this is a feature introduced in the iOS 9.3 interim release) it will be stable and usable more broadly.
The combative attitude many on HN have towards apple is more about being in the Google camp and seeing them as the enemy, than about Apple doing wrong by anyone (Yeas yeas, I know they take %30 of transactions, but that's an improvement over the %80 that previous generations of mobile software developers had to give up.. and other stores take a similar cut. etc.)