I think this post tries hard to claim something that wasn't quite the case. The author did not overcome a "no". They "overcame" a "sure, next summer might work"

I think this post tries hard to claim something that wasn't quite the case. The author did not overcome a "no". They "overcame" a "sure, next summer might work". Which, given that they were a student, was really a "sure, whenever you are free might work"; the company assumed that they would be studying during the fall. So what remains is that in the initial mail, the author presumably failed to mention that they would be free already in the fall. If they had, it looks like the company would have happily interviewed them for their fall internship program. So my reading is that there really was no "no" at all to overcome, just some unfortunate initial communication. Including the fact that the company created the impression that they "weren't hiring", while in fact they were.