The average guy is not weak! He's... wait for it... average!
It is elite when you consider the larger population, of course not by powerlifting standards.
OK so by now you may have guessed that I'm around 90kg and cannot dl 180kg. I haven't tried to max out for quite some time but 160kg would be my max I believe. So that makes me pretty weak, and I'm ok with that. Well actually not really ok since I'm striving to get better, but you see what I mean.
I believe the caveat in your statement is about "putting the few months of work in" and "healthy" and "able bodied". I would also add as j123 said a good program and a good diet.
So I'm not saying this is very difficult to achieve, but it's starting to pile up. A LOT of people, or at least much more than you guys think, will not be able to do it. If they went back to HS days with nothing to do, hormones raging and all that, then yeah maybe. A guy like me who starts lifting at 35+ yo with past injuries and all this, well that's different.