My impressions:
Target appears to be over 30 feet away. My house, which is 3500sf only has one open space that is over 30' wall to wall. 30' ranges in a home are unusual. Target should have been placed at 10' 15' to simulate a home defense situation.
Wide open space - no walls, no doors, no furniture, no obstacles to navigate around or for perps to hide behind. Rifles are great for outdoors use - proves nothing about home defense use, however.
It's daytime in the video - most home invasions are going to be at night - you might need a free hand to turn on lights, find your cell phone, hold a flashlight, open doors, etc. Rifles, even carbines are two-handed instruments for most untrained people.
Do you really think someone who is unfamiliar with AR's is going to keep a round chambered and the AR in a convenient location for home defense? Probably not. So, she's going to have to chamber a round before the AR becomes anything more than an awkward stick. I'd like to time how long that takes her - watch the video again, she doesn't even chamber a round - done prior to the video! On the other hand, a DA/SA handgun is good to go as soon as you pick it up.
How many people carry their AR's to answer the door? How many people carry a concealable handgun when answering the door?
I could go on and on, but IMHO, a good handgun beats a rifle or shotgun for HD.