Because people tend to read into such sheets what they expect, not what is actually presented. As soon as the reader starts to interpret or make assumptions, he is venturing into territory that is excluded by the disclaimer.
I am not claiming that the (nominal) .268" bullets and the loads published in the handwritten data sheet (which does not appear to bear the name of David Emary) or the lengthy article which does bear his name will be dangerous, hazardous, fun, or the most accurate load ever derived. I am not making any claim about the applicability of the load at all.
As for
in
if you had trouble with that load in any other Carcano, I suspect you would hear something on the lines of
"Reloading is always on the responsibility and risk of the user..."
"You must have misunderstood him..."
"Brad had no authority to make such a statement..."
"Brad who?"