Hello Sivasankaran Gopalan, I acknowledge your question. The provision for maintenance of divorced wife is given under Section 125 of the Code of Criminal Procedure,1973. Under this section there are few grounds wherein the wife can be refused for maintenance they include
1. The wife must not be living in adultery
2. She must not refuse without sufficient reasons to live with her husband
3. And she should not live separately by mutual consent
Under this it is given that a divorced wife cannot be considered as a wife living separately by mutual consent because the former status is due to dissolution of marriage. And in your scenario where the divorce was by mutual consent and both the parties have decided under the agreement that the wife shall not claim for maintenance, likewise when by mutual consent wife stood down on her maintenance she cannot claim for the same later on.
I hope I answered your query, if you still have any query, you can drop here.
Have a good day.