That's nonsense, clearly, because we've just elected two - no, make that four Presidents in a row who used the Military Industrial Complex in radically divergent ways to different ends.
If we test the theory that American Presidents are beholden to the military industrial complex and not vice versa, compared to actually authoritarian countries in which the military basically is the government, we can see all sorts of civilian controls which restrain our government versus the others.
When I said it was like Argentina in the 60s, I meant that it definitely could become a quasi-mitary autocratic regime, but at the present moment it is not. It's just in the throes of populist movements which might ultimately lead to such a thing. Any objective glance at actual military regimes, any knowledge whatsoever of the rest of the world's history, proves immediately to a casual observer that the United States is not currently comparable to a military dictatorship.
The attempt to frame it as one, however, is blatantly ignorant of the current state of the world, to the degree that the motivation behind doing so is suspect. Really, only a shill for a dictatorship is interested in trying to prove that America is analogous to an autocratic state. An objective observer who wasn't being paid or hadn't bought into authoritarian propaganda would at least compare and contrast our legal system with the true, terrible, and numerous actual dictatorships all around the world.