OK so since when is the moderators judgement of whether an answer is right or wrong a reason to delete it.

In this answer, https://electronics.stackexchange.com/a/342672/139766, the moderator deleted it because he decided I already mentioned some of it in a comment, despite the fact that the answer detailed far more than my original comment.

I understand, for the moderators comments that he believes what I am saying is a non-issue, which is fine, and he may be correct, but since when does that give the moderator the right to judge answers and delete them based on personal judgement.

I might understand it if it was marked down a few times... maybe.. but not in this case.