I don't see any iOS notifications about comments at least in current version of iOS app. All types of notifications are enabled in settings.
- App Version: 18.104.22.168
- Device: Unknown (iPad7,3)
- OS Version: Version 10.3.3 (Build 14G60)
Notifications started working after reinstalling the application. Reinstallation was required to reanimate the application after the crash described in the Ethan Bierlein's question.