Paul Gomez is an excellent instructor. He and SouthNarc instructed the ECQC classes I attended back around 2005-2006, so Paul is not exactly new at the business.
I don't watch YouTube videos anymore, as my gadgets spend far, far more time buffering, or whatever that process is, than playing, so I cannot comment on this video clip itself. I don't have the whole afternoon it takes to watch a half-hour YouTube. I do remember, however, remember Paul's thoughts on choosing 9mm, and have no problems with any of it. While I tend to prefer weapons chambered in other cartridges, 9mm is fine with me. This is not the 1970s or 1980s, anymore. Controlled-expansion JHP science has progressed far.
I may well start carrying 9mm as a duty cartridge soon. Though we (very large PD) standardized on the .40 for uniformed patrol in 1997, a new policy has been sent up for the chief's signature, to add 9mm as a second standard cartridge* My aging, ailing right wrist will certainly welcome the change! A SWAT officer of my acquaintance, not bound by the .40 standard for patrol, and quite the big-bore fan, has already gone 9mm. I have a pre-owned, gently-treated G17 on layaway, already. (The G17's lower bore axis will
additionally help mitigate recoil, compared to my present duty P229.)
*I cannot specify the PD; we are prohibited from discussing certain subjects on social media while being identifiable as a member of the PD.
I do still like .45 ACP. It is the .40 that I find rather useless these days.