I wouldn't mind talking to him at all. I'm aware of the typical sort of misconceptions that live among so many people regarding the elvish languages. Thus it'd be undesirable indeed, as you indicate also, to have some Grelvish user adding more to that.
Incidentally, I know the person who wrote mentioned iPhone app though, luckily I might add, not very well. It was probably the shortest msn conversation I've ever had the displeasure of not being able to avoid altogether :(
Thinking about the "speaking" in particular; I'm willing of course to bring forward other opinions as my own, as long as they mirror a cross section of those with a serious interest in the elvish languages. Though I am very enthusiastically for (also) using these tongues in speech, albeit respectful of the original context, not everyone is. But I needn't tell that here, of course.
About the requirement that the reporter stated as being a "daily user": I'm not at this time, but I was sometime ago when a short chat in Sindarin over Skype was one of the things that my study partner and I used by way of exercise. The problem is that there's not much people around who seriously want to try and speak Sindarin. But it remains my conviction that it can be done, even within the limits that the (linguistic) state of the language imposes.