This comment-like answer was posted by a rep-1 user with no (AFAICT) other posts, and then silently deleted within 15 minutes, leaving the poster wondering why.
The user then posted a copy of the answer, where some others have commented and let him know that "This place is not like a forum. Your answer should literally answer the question.". A while after this the answer was deleted too.
The second deletion was OK. But the first one could have been better IMO. Particularly, I'd expect either the moderator to post an explanation (maybe canned, as available in the Review), or there to be a banner (or whatever it's called here) above the post, explaining what's wrong with the post and linking to the relevant documentation. The Q&A format is not very familiar to many new users, after all.
Or am I missing something? Is there already an explanation that's not visible to anyone except the poster of the deleted answer?