Isn't that exactly the same as mine?
No because you repeated step 2 several times and your step 4 is complete nonsense. Danny said divide by 1.25 not multiply or divide by 1.25.
As for being a scam, most if not all scams try to get something from you. Danny by th way of Kavvz gave this to us freely.
The 2 things you might be missing is #1 you have to know what the distance to aim from the hole correlates to your monitor.
#2 you have to have the speed of the putt right. Hit it too hard and it won't break as much as the calculation, Hit it too softly and it will break much more that the calculation.