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Sufficient_Bat_5023 posted on r/whatsthatbook5w
It’s this novel on Amazon Mary R Strawbridge His Greatest Mistake: A Second Chance Billionaire’s Betrayed Heiress,Romance of Heartbreak,Secret Child,and Revenge I think it may be AI though looking at the reviews https://www.amazon.com/His-Greatest-Mistake-Billionaires-Heartbreak-ebook/dp/B0FY2P99PP?dplnkId=3ba21779-c8b5-4b62-9dc5-5bc7836d0ae5&nodl=1