I don't know if I agree with him on this. One of the most important aspects of a military handgun is safety, because you might be diving into the dirt and rolling around on the ground and climbing over things, usually with other guys around and in front of you. Not to mention the military will often spend time bouncing around in armored vehicles or tanks, or flying in helos where an AD can be catastrophic.
A DA/SA gun is superior for military use because if need be you can still do all these things while safely keeping a round in the chamber, especially if it also has a manual safety like the M9.
Also, drawing and shooting quickly is less important for military use because most engagements happen at pretty long ranges, and because you will rarely be alone in combat. You will have other guys with rifles around you.
These aren't the case when you're a cop and you are dealing with threats at close ranges and having to draw a gun from a holster and quickly fire it is more important because you aren't gonna have a fire team with loaded rifles around you and you often don't know what other peoples intentions are. Plus its generally not good public relations for cops to have their guns drawn a lot, so a cop might still have their gun holstered in a potentially dangerous situation, whereas that's not really a thing in the military.
All of these are why Glocks caught on like wildfire in law enforcement while the military took a pass. Glocks are great for drawing and firing quickly, but this comes at an increased risk of AD's. In the military things must be more idiot proof because of the nature of the job and the environment, and by that I'm not implying military personnel are idiots, they usually have superior firearms training and vetting over cops, at least in combat arms.