It doesn't do any better? So you are telling me iMessage is better than what Rooms chat does between employees? You are telling me OneNote sync is better handled and experienced between iPhone and SP3 than SP3 and Lumia 1320? I can disagree totally.
You manufactured scenarios that he didn't mention using. What he mentioned, SharePoint and Office 365, is every bit as good on iPhone, arguably even better. Few people will say that Microsoft's iOS apps aren't better than WP's equivalents.
Here's an example of a Microsoft service that is great on Android (I don't know if it's on iPhone because I don't currently have one) but is non existent on Windows Phone: an app called "Microsoft account" takes the code out of 2 factor authentication. Instead of checking your Authenticator app for the code and typing it in, you tap the "Approve" button on the app, and boom you're in. In fact, if the app isn't open you don't even need to open it. A notification pops up in the notification bar and you simply Accept. No muss, no fuss, no need to type a code, which may be expired by the time you get it entered.
I will admit that I haven't had an iPhone for about a year, so I'm not quite up to date. I do use WP and Android side by side, so I know the differences in Microsoft's services on those 2 platforms. I also know that the iPhone's experience in the Microsoft ecosystem at least matches, and often supersedes, Android's. I also know that not too long ago Microsoft released new Office apps for iOS that has other users drooling.