In this post, the poster also supplied the answer.
I wouldn't comment on it, except that I noticed that both post and answer were published on the same minute. I understand from this that the poster has prepared both in advance and posted them both simultaneously, maybe as a way for getting upvotes.
As SU is a Q&A site and not a blog, this case seems to me to be in a bit of a gray area. We are all supposed to share our knowledge, Q&A-style. But this method, if it becomes common, can mask questions by users that have legitimate problems that need solving.
I'm wondering if there is something wrong in what this poster did, publishing an already-solved problem. And if there is, what we can do about it.