Thank you for your question. I look forward to working with you to provide you the information you are seeking.
You have the right to file a suit against him for breach of contract
(the confidentiality and non-disparagement clause in the settlement agreement) as well as for slander and libel for making known false statements against you and take him back into court and seek to get awarded monetary damages for his violation of not only the sealed settlement agreement but for the false statements he is making now against you and an injunction against him to stop him from making further comments and to make him remove the comments he has already posted.
This is the legal recourse you have to pursue him to stop the matter from continuing on.
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Also remember, sometimes the law does not support what we want it to support, but that is not the fault of the person answering the question, so please be courteous.