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No, the "temporary and permanent wound cavity" are not increased by that penetrator round, only the temporary cavity is. He's clearly mistaken, at two minutes into the video. You can read Martin Fackler like I did if you need to understand why temp cavity has nothing to do with wound channel.
It is true that the big issue with .380 is penetration depth, which means in practice the round has to stay together. Any bonded JHP is going to give you the weight retention you need to get that depth.
As far as 7-8" not being enough, I'm surprised that anybody still drinks that kool-aid from the FBI HWFE document. For pete's sake, it's one man's opinion, from a long time ago, that's been completely surmounted by a ton of empirical evidence about just how effective the .380 has been in actual practice.
Personally, I think the 9X19 is marginally adequate, so the 9X17 is a bit worse. But I also know that the one in my pocket beats the gun in my sock drawer, and there is a real reason the .380 remains so popular. Those teeny 9X19's are way too punishing to run through an all-day class, and no newly minted CCW is going to be happy with one.
I think the FBI has revised their standards to include some clothing and 12 inches of penetration minimum to 18 inches. Thankfully I do not expect to come up against zombies, extraterrestrials, or criminals with body armor. Could happen I guess, but I think the passing rounds in the OP's video are 'Good enough' for me.