Are you kidding me? 90% of what people do in iOS is in an app. Email (app), chatting (apps), Facebook (app), dating (app), Instagram (app), Twitter (app), news (app), games (apps). I could go on for quite a while until I start to encounter things that aren't in an app (e.g. Hacker News).
To be fair, the actual claim was "Apple's apps can replace all but some long-tail usages." which is blatantly false.
I'm not an iOS user so I might be a little off - but of your list Apple's apps do Email, chatting (for their protocol anyway), maybe they have a news app?
You can do pretty much everything outside the long tail with apps - usually with the better experience (outside of the long tail again) but they're mostly not Apple's apps.
