After the votes, the comment asking for clarification and several down votes, it’s clear that answer isn’t going to reach to the community standards and has been deleted.
Thanks for allowing the moderation process to be “moderate” and not “one strike and you’re gone” quick. The rest of the reasoning / policy remains here so people know why it was voted or what potential reasons for declining a flag when an answer has no down votes happens in the future.
The normal escalation path is to use voting and comments to indicate a poor quality answer is there.
There’s no need for moderators to handle all the steps and typically I prefer not to delete an attempt to answer unless there are several down votes or a post notice or comment wouldn’t be suitable address a poor quality answer.
In this case both a comment and post notice were chosen to get the answer edited or attract down votes as needed.
Flag things that are actively harmful or require intervention when normal moderation tools cannot remedy a bad post. Even wrong answers shouldn’t typically be flagged. I’m not seeing any harm in leaving it up with the post notice to explain how this answer could be improved or at least judged by voting.
At this point, no one has cared enough to even down vote it. Now it does have some down votes, showing that the community can color that answer as not useful.