I don’t think that “without offset” is a problem – it only means that no money has to change hands to offset the transfer of wife’s interest and liabilities to the husband.
A bigger concern is that California Family Code section 2640 only applies “…in the division of the community estate” in other words, during divorce proceedings. Since the divorce has been final for two months, it may be too late.
And there may have been some legal boilerplate in MSA that automatically waives all claims and rights to reimbursement that haven’t been addressed by MSA.