Is God Helping People in the Past Based on Prayers in the Future?

Doctor libovitci's experiment provided evidence from the reason perspective that suggests god will help people in the past based on prayers in the future. In 18 95, a book was published called charity for the suffering souls by father john nigellison, who was a missionary priest. He specifically addresses the issue of god helping a person die in grace based on some one's future prayers and to retroactively helping some one out of purgatory. Masters of spiritual life ascribe these sudden effects of grace to various causes. So this is not some new fangled modern thing in catholic theology. It's been around for quite a while.