Where did he say that? I’ve heard him say the ideal ar barrel length is 18 inch, not 10 inch. In fact he said “you lose a lot of the versatility, lethality and incapacitation of the rifle” with an sbr barrel length in 556 caliber. He once said that down to a 16” would be okay, but never heard him recommend anything shorter than that, for anyone who actually has the physical strength to use a carbine-length gun.
He bought his wife an 11.5” ar pistol to train with, solely because an actual carbine was too heavy for her to use in long-duration training sessions. (If that’s an issue for you, it’s good to realize it and work around it. Personally I can handle a real carbine; ymmv.) But he emphasized that the ar pistol was for training sessions only, where the time frame she’d be using it would be long enough that the weight of her “real gun” would be an issue. He specifically said that for actual home-defense use, the rifle would be what was used by her.
He’s even said that if you do have a shorter barrel, make sure you have special ammo to account for the reduced capabilities, and your recommendation of staggered 60-grain sp’s and m855 do not fit that description at all. In fact, he says the m855 is about the worst choice, and personally I agree completely with that.
He also said the ideal sighting system is a red dot with flip-away magnifier, not the lpvo you recommend. (Personally, I’m okay with either.)
To go further down the rabbit hole, he says the three best bugout/survival rifles are two different versions of the ruger 10-22, and an accessorized ruger charger. All three of them with red dots, and all three of them being dedicated, rimfire-only guns.
So again, where does he say that an sbr 223 with a silencer is ideal? Because if he actually did, I’d genuinely be interested to hear it.