What is commonly known, and is referenced in the report, is that continuous loading of the same round(s) will eventually create an excessive pressure situation as the projectile is driven deeper into the case due to repeated contact with the feed ramp under force. As a .45 ACP round operates in the 21,000 psi range, projectile set-back may not create an over-pressure problem. When the S&W .40 cartridge, which operates at the 31,700-33,600 psi levels, several thousandths of set-back could generate enough of a pressure spike needed to disassemble the pistol.
What is shown in the Utah Concealed Carry.com post is that chambering one round seven times can set a bullet back about 12 thousandths of an inch deeper into the brass than it is when manufactured. This is what leads to the pressure spike mentioned above. If you carry a concealed weapon, or even shoot in general, please go read that forum post and look at the pictures!