"I agree that maybe the term "shutdown" is what sets some people off before they even read it, but that is a marketing issue beyond my pay grade
(made me laugh)
Yes there is the shutdown
a dog will do itself if over commanded to point of confusion and after avoidance doesn't help clue the handler into "this ain't working!" (too much compulsion can cause this)...so reading 2 week shutdown does make one cringe if you remember old school ways from before new school ways existed.
It can easily take 3-4 weeks of "dating" before the newbie is confident his/her needs will be met and then the real character can shine through, and a honeymoon may not be the outcome one wished for, especially if not enough time was taken to sort the hierarchy of this pack, now in conflict as it absorbs the intruder. (Not all members may think this is a good thing)
Using a crate for management and quiet time, keeping it simple until some bond begins to grow, all these things sound sane to me.
There is a lot of prejudice in our society against our breed, and it can affect folks' reactions. Your vet hasn't ever owned one, I'll bet.
I understand your concerns, telling kids not to run isn't likely to work all the time, and it can trigger unwanted herding or worse in some and that is
worrisome. Taking it all slower might have prevented that altogether, but it happened, and so it's a worry, but if you back up, slow down and work on the bond, over time it can be overcome.
Employ a lot of praise whenever appropriate, you should see improvement rather quickly. If it's all too much, you'll have to punt, but you aren't there yet, or he'd already be gone.