I think what people are saying is that those Schwalbe tires are not flat proof, but they are highly flat resistant; yes you most certainly could ride across the US and never get a flat, the chances are high that would probably happen. I have a couple of thousand on my Schwalbe Almotion tires and never had a flat, heck, there's not even a tiny cut on the tires even after riding miles over broken field of glass.

I did cheat with my Almotion tires, I added Clear Motion Rhinodillo flat-liners to my tires because I want to make darn sure I don't get a flat on a loaded bike. Rhinodillos are tougher than Mr Tuffy liners, I had an old Tuffy liner and I could put a tack through it pretty easily, but bent the tack on the Rhinos and couldn't penetrate it, and then I tried to cut them both with scissors, and the Tuffy cut like butter, but the Rhino hurt my arthritic hand, but I did manage to cut it. Adding a liner may sound like an overkill for tires like the Schwalbe Marathon Touring Plus, or my Almotion tires, but like I said, I don't want the headache of a flat on a loaded bike.