There was an Indiana State Trooper who died using the method that Spaulding describes. The troop put his shoulder into a door on a warrant and the gun discharged into his head. Obviously he had a finger on the trigger and the gun most likely lower than they are describing. For years after all of the tactically inclined guys I rode with as a police explorer would talk about that incident and then say don't do "high Sabrina," a take on the Charlie's Angels show of that era. When I saw this technique many months ago I was taken back to that time frame.
One of our guys was also exposed to a similar technique though not as aggressive as what Nyeti described from the "unit," from two active duty guys. He came back to the team and wanted us to go to it. I immediately said no, we are not them and never will be. He was not happy about it. I called a friend who retired from that same unit, he said yes there was a technique used with pistols only and under very specific circumstances. He was glad that I had seen the light and said more individuals, teams etc need to realize the difference between guys who train for thousands of iterations and have the combat time to back up such techniques vs. the guy/gal who the average shooter but will never be even close to the level of skill the unit guys possess.
I see this as guys getting worked up over a technique that most should steer clear of.