Yes, it's definitely harmful to let the community know that he's still alive, still monitoring the thread, and still making progress on the coin. I can definitely see how hearing from our dev from time-to-time is severely damaging.
If I am an optimist, I assume that he's doing all these things anyways. If I am a pessimist, I might as well say that this post was created by a bot, because it is entirely generic and does not reference anything recently discussed here. On a more fundamental level, the fact that he feels the need to make this kind of post at all is IMHO a workaround to the problems created by the decision to keep development secrect. If we could simply follow commits as they happen on github, there would be no need for vague statements of reassurance. And who knows, maybe somebody might even get intrigued by what they see and start contributing patches and so on.
How the hell does that look like a pump to you? Did he tell anyone to buy? Did he tell anyone the value was going to the moon? Did he give anyone a price target?
I'm not saying that this is his intention, but we all know the hostile environment Dash is facing, so I just don't understand why someone would want to make the trolls' job even easier. Also, let's be honest: If this were some coin you've just discovered and you saw the dev posting vague "great things are coming" comments, wouldn't that be a red flag to you?
If you don't like the "teaser-based marketing strategy" then stop reading the forums, and come back in late January after BTC Miami and read what Evan has to say then, when more information is on the table.
Yes, I was actually thinking of doing exactly that. It's not that I doubt the team's intentions or technical abilities, but it's just so painful to watch them shoot themselves in the foot communication-wise time and time again.