I understand from this that the poster has prepared both in advance and posted them both simultaneously, maybe as a way for getting upvotes.

When you submit a question, you are given a chance, to also answer the question. Both the question and answer are submitted at the same time when you do that. I have done it in the past myself, when I had a problem and knew what the problem was.

I doubt it has anything to do with earning reputation. The user had a problem, knew the answer to the problem because they figured it out, and thought other people might have the problem. We should encourage this behavior.

I'm wondering if there is something wrong with what this poster did, publishing an already-solved problem. And if there is, what we can do about it.

Users are encouraged to self-answer their question.

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 don't see how the question nor the answer, in this case, could be considered a blog.

I understand from this that the poster has prepared both in advance and posted them both simultaneously, maybe as a way of getting upvotes.

When you submit a question, you are given a chance, to also answer the question. Both the question and answer are submitted at the same time when you do that. I have done it in the past myself, when I had a problem, and already knew what the solution to that problem was.

I doubt it has anything to do with earning reputation. The user had a problem, knew the answer to the problem because they figured it out, and thought other people might have the problem. We should encourage this behavior.

I'm wondering if there is something wrong with what this poster did, publishing an already-solved problem. And if there is, what we can do about it.

Users are encouraged to self-answer their question.

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 don't see how the question nor the answer, in this case, could be considered a blog.