Keep on mind that NYPD was not a leader in adopting advanced ammo, largely for political reasons and because so many in their ranks were not gun-oriented.

McGee was a NYPD official,and had to toe the bureaucratic line.
He was correct that shot placement is vital, but would have denigrated better ammo, because NYPD couldn't use it!

Studies in gunfights show very little improvement when using non-expanding bullets of SWC design over RN bullets. HP bullets of good design DO seem to make a difference.

But NYC is a very liberal environment, where activists opposed HP bullets. Always keep in mind the bureaucratic factor in reviewing NYPD ammo. The same applies in other cities where "community spokesmen" made a political matter of ammo.