It's not very helpful at all.
What is meta?
- Any Stack Exchange user can ask a question
- The community provides support, votes on ideas, and reports bugs
- Your voice helps shape the way Stack Exchange operates
I am of the strong opinion that answers which essentially are:
should be converted to comments. It is NOT an answer. For users with the right to, the failure to flag as dupe is especially egregious.
He intended to link to the question itself, not his answer - as the question got Accepted Answer it also help the other case.
He probably posted that +5 answer shortly after the -2 (now -3) answer so he copied the full URL which link to the answer he just posted.
I considered editing the answer and remove the
I am not familiar with the technical details of the post in question so I can just answer in a general case. Main causes that I see are either: