I didn't do as extensive testing as in that link, but I did enough to know that dropping a 1911 on its muzzle can and does result in firing from firing pin momentum alone (no hammer fall). I also found that the old type pistol would not fire when a pistol with a full length guide rod would fire at the same drop distance even though the pistols were the same mass (rounds were removed from the magazine to keep weight the same). The reason is that the old setup allowed the slide to move back when it dropped, absorbing some of the momentum, where the solid FLGR did not allow slide movement.
Of interest is that the engineers who designed the Polish Radom found the same thing, which is why they went with a telescoping guide rod instead of the solid one in their original design.
Jim