I provided an answer here on a closed question asked on July and I would really like some feedback (I am not after reputation points!). Since it is already answered, it is unlikely to attract any people to comment. What is the best way to do this without nagging people and making a new question?
That question is not closed. It is not possible to add answers to a question that is actually closed. See this question as an example of a closed question.
The question you linked to has an 'accepted answer' which does not prevent other users from adding answers as you yourself did. When a new answer is added to a question or a question is edited that question is bumped to the top of the active questions which enables others to see the new answers and/or question edits.
I am sure several users have seen your answer and would have left comments if they felt that they were confused about some aspect of your answer.