I just got:
declined - flags should not be used to indicate technical inaccuracies, or an altogether wrong answer
For flagging the following post, using the <not an answer> flag, which is ok, but I think it could be helpful to have a flag for such a case, something like "Misleading" or "Technically incorrect", because such an answer with 105 upvotes would definitely mislead visitors and it does not answer the question or part of it.
Is there anything one can do in this case to bring moderator attention other than flagging the post? downvoting doesn't really help here with 105 upvotes.