A similar result was reached in Tornstrom, 2016 WL 6826258 reported last week. In that case the parties reached a settlement after 8 hours of negotiation, with assistance of their attorneys, and the agreement was audio recorded. Thereafter the wife refused to sign a written stipulation. The court found that all of the elements of a binding contract were met.
Unfortunately this type of dispute is quite common as litigants reaching an agreement either succumb to "buyer's remorse" or discuss the settlement with family or co-workers and are told they got a raw deal or bad advice from their lawyer.