Im going to stand by the description of this app as simplistic (for trying to boil social interraction down to a single word), though I will agree that this is an editorial judgement. That being said, the concept of simple is relative, making your description of the app as simple an editorial comment as well.
As for misunderstanding the definition of the word, having spent my professional life embroiled in the complexities of the English language, I wont pretend that the usable definition isnt/wont changing/change. But if youll consult your nearest dictionary, I think youll find my understanding of the term is fine.
As an editorial judgement, possibly -- but not as a description of functionality, and the latter is very clearly how MR was using the word. They were trying to communicate the minimal level of effort needed to use the app, not that it makes a complex task appear less complicated than it is in reality. MR makes these kinds of head-slapping errors on a daily basis. I don't see the point of defending them.