Your husband is a piece of work. He can claim whatever he wants. Whether the court will side with him, I seriously doubt
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Your question is unclear - is he proposing a second and different PSA?
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You can seek to finalize a divorce asking the court to find the PSA to be a controlling document confirming a settlement of any and all issues. The burden will be on your spouse to have the document set aside.
Depending on the facts and circumstances you may still be able to secure your spouses cooperation in moving forward in a swift, amicable way. For example, the modificaiton he is seeking to the PSA may not be significant enough to justify contested litigation.
If you would like to discuss you matter in greater detail, please do not hesitate to contact me.
Kenneth A. White, Esq.
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You may need to enforce the agreement and that process does require you to speak to an attorney for the ins and outs.
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