All that I can say is I would like to know what product they were smoking while they were figuring this out, and where were they getting their information from.
I own two 10mm's, both 6 inch barrels.
I load for accuracy, and I use the Sierra software for calculations, G1.
Real chronographed loads, 180 grain bullet, at 1276 fps (not beating the pistols up,)
The load is 13.2 accurate #9.
11.0 grains accurate #7 is the same velocity.
You get 650 ME at the muzzle, and at 25 yards 582.
Warm loads, but not wrist breaking.
This load is very accurate, and very consistent.
The original goal of the 10mm was to equal the .357 mag, with more rounds in the firearm.
This you can do, but double the .45, I doubt it.
I remember a video of a guy shooting a 600 nitro in a pistol, but he had to chase the pistol after he fired it.
The 180 grain weight bullet is very accurate, so I don't bother with the 200 grain.
You can get close to double the ME over a .45, but not in a 10mm, unless it has a very long
barrel, and pierced primers, broken brass, a lot of powder jammed into a case.