I read the PDF a couple of times, and in terms of suspicion indicators, it seems pretty reasonable to me. Especially since it is specifically for military surplus stores. I would expect more indicators for gun stores to be honest (although the surplus stores I have visited never carried ammo).
There are a couple of things I find comical or don't like:
Suspicion Indicator: Have missing hand/fingers... I laughed out loud at that, then got a little bothered that people with those conditions would be singled out. I would be much less bothered (even supportive) if it mentioned missing body parts that were fresh (bandaged). Chemical burns seems like a reasonable suspicion to me.
Suspicion Indicator: Insists on paying with cash. That shouldn't be an indicator in my opinion. But if combined with some other indicators, it is something to be aware of. And the word "insists" is important, if I am paying with cash I don't insist anything, I just pay. If one were to bring it up by insisting, that would be weird (an indicator).
Bulk Purchase: Meals Ready to Eat (MREs). Having a long lasting food stash is important to me, and I have a considerable collection of MREs and dehydrated foods. I use them while camping so they turn over (I buy the cheap MREs, the older ones). I also have multiple water filters, tons of replacement filter, and other assorted "let's go" stuff.
Otherwise everything seems pretty straightforward. If one mentions violence or aren't familiar with things you are purchasing then I would say it is a fair indicator.
And I don't see the Constitution mentioned, only anti-US commentary is called out.