Re: "If it appeared on screen, it's canon." THIS is canon?!?
OK, I watched it. Scotty appeared to be in Enterprise D's engineering section, for some reason.
I'd say that this isn't canon, despite being "on screen", since it is a commercial and not from a series episode or movie.
It is the stated position of the Department of Defense and the United States Air Force that a rigidly enforced system of safeguards and controls insure that occurrences such as those depicted in this story cannot happen.