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What to do depends on your particular situation. There is no one size fits all plan. I didn't watch the video so I don't know what it says exactly. I just know from my own experience (yes, a real break in did occur) and what I learned is that much advice on the subject is not a viable option for me.

I would love to just hunker down in the bedroom and call 911 with a imaginary line behind which all is safe and in front of everything is a threat. That might be a viable option for some but is pie in the sky for me
under most home circumstances it would leave the kids out in the wind and there is no way I'm gonna do that.

My reality is that everyone is spread out all over the house from front to back and left to right and to be able to protect them means actively intercepting, engaging and neutralizing the threat, at best going out into the space and securing each family member one by one room to room until we are all in a single room hunkered down. I think it is likely that I will encounter the threat first. My home is not that big.

Take what applies to you and any particular situation you may find yourself in and don't be afraid to ditch conventional wisdom or "expert" advice if it doesn't apply to you.