(Read this with an open mind! Some of you seem confused. One way or the other: mistakes have been made. I'm merely sharing my best guesses on why the article got deleted.)
First off: This guy's points are all valid.
In my opinion, it's not so much about NodeBB not being popular; although the discussion revolved around that. Quite honestly, I wouldn't approve of the article in question myself. Is there a way to get the text back? Did anyone save it? I'd like to give some examples, but can't, now that it is deleted.
Anyhow. Back when I read it, my overall impression was more like reading an ad than a wikipedia article. Please keep in mind that wikipedia aims to be an encyclopedia. In that, there just isn't room for "We want to", "We plan to" and anything of that sort.
- "will soon allow integration with services such as WrapBootstrap" - Well, that's fine. But is it a fact? No, it's not. It's again just a claim of what will be. I am not that familiar with wikipedia articles, but I feel that there's also no justification for forseeing the future in those kinds of reads.
Then there's the (inferable) intention in this very topic - which the deleter refers to:
Phrases like "Thats the most important page to be on" make me think: Why is it important? I mean, the strive for gaining popularity can too easily be infered.
Last, but certainly not least, maybe the biggest mistake was to call for action. The very first post in this thread acknowledges the fact that you can't write an article about yourself, but simply delegates the task at the same time. Actively asking one of your users at least implies that the article is (again) written by NodeBB itself. I think this is also where this notability claim might be based on. Try to see it as you having given the job to an amateur (no offense) agency. It's not like someone stumbled upon NodeBB and went: "Hey, that's nice. I'll write a wikipedia article about it."
I admit, those are minute details, but they still are there. And I am actually pretty relieved that wikipedia authors think in and act upon those details. It's an encyclopedia! It has to be unbiased, neutral and almost painfully correct.
Putting myself in that guys shoes, I'd be pretty pissed too, if someone was to accuse me of "fanboyism".