Here's one of many posts discussing the version of fico scores used for mortgages
http://www.doughroller.net/credit/which-fico-scores-do-mortg...
Googling will get you dozens more. Maybe you found one fico8 lender; good for you. More likely, you have no idea at all what you're talking about. Further, experiments mentioned above (you can find on creditboards or r/churning) were replicated across many people, not just one.