I have heard of instances where perps absorbed 40+ pistol rounds before being taken out with a longarm- as well as big game that had true high-power rifles emptied into them by experienced hunters. With that in mind, a single incident (as the above) or few encounters really don't mean much, but rather, what happened the majority of the time.
.30 Carbine rounds typically sail out at 1900-2000 fps from the muzzle. Not exactly a powerhouse, but when you consider that the bullet weighs twice what the typical .223 round weighs- while going 2/3 as fast. (For comparison, think of how people view the .45 as a "powerful" round, while 9mm many view as marginal. You have a nearly identical ratio of weight and speed as compared to .30 carbine vs .223.)
I have no anecdotal information, but I hope to do extensive testing with the .30 Carbine on hard targets in the near future.
The .223 is not known as an effective performer because of the power that it generates, but because the bullet construction was such that it tended to deform and/or fragment, and therefore increase the damage done. With expanding ammunition, an M1 Carbine should be an ideal home defense weapon, and in fact, is what Dr. Martin Fackler uses. It is also what is beside my bed.
Incidentally, the 7.62x39mm is marginally more powerful than the 5.56x45/.223.