There's a couple of them, not just the one - at least, I think that's the case. I'm sure I've seen more than seven posts, anyway. But yeah, there is definitely a lack of posting done by the SE team in the English forums, but I suppose it's as much as can be expected since they are, well, Japanese first and foremost. Still, the forums are also in beta stage so it's hard to be sure on just how the forums will turn out in the long run. I am convinced at least for now that the dev team are certainly listening to the concerns, though, so the forums aren't entirely useless.

The dev team don't seem too keen on giving much away at the moment, though.

EDIT: According to the Dev Tracker, the following users are either devs or community reps and they have made a total of 158 English posts...
Triary
Rukkirii
Hvinire
Bayohne
Naoki_Yoshida
Gildrein
Foxclon
Mocchi
Duckbill
...I imagine for the most part they are either devs with a bit of knowledge of the English language or else are SE's people in NA/EU that work on local translations. I'm sure I've seen it mentioned somewhere that some of the community reps are translaters for the game. It makes sense, I guess, to do things that way.