It's said sometimes on HN that "actually implementing it is the real problem, not coming up with the idea". This is referring to startups; in this domain an idea like "let's do a site just like myspace but with feature X!" is worth nothing, but an actual product can be worth a lot.

I think it's no trolling, he just translated this to a domain where it makes no sense, which is a good reminder that web startups are not representative of all programming/business/engineering problems. And that one must be careful not to use a phrase like a meme, without thinking about its implications.