I can't help you if you didn't understand what they wrote, even if it isn't robust.
They are wanting to equalise the average winning margin of a 3yo to be that of an older horse, so that in theory, the strike rates will match.
They told you the average variance in winning margin between a 3yo and a 4yo ranges from 0.2L at middle distances, up to as high as 0.4L at high distances. That is what they are trying to correct .
Actually they claim 0.4L. which is what the 3lb is attempting to address. Yet at those distances, 3lb less should change the margin by nearly 3 lengths if we believed your tripe
So in their wisdom, they chose to adjust the allowance by an amount they believe will bring about the reduction in average winning margin to that of a 4yo. A 0.4L adjustment at the longest distances.
Ergo, they are claiming 1 to 2lbs will make the 0.2L adjustment at some of those middle distances, and 3lb is required to make an adjustment of 0.4L.
Why do you persist in highlighting how uneducated you are.
I know it had writing and wasn't all pretty pictures, but the non robust report still supports my claim. Not yours. Hahahaha.