I wouldn't go so far as the post you're replying too (I think you can do a startup without all the advantages named, but your risk looks different).
However, I think you are falling into the trap of identifying outliers and then trying to reason about the general case from it - it's pretty hard to use that to say anything more that "it's possible for X to happen, because it happened here, and here."
That's all I was saying, that it is possible to bootstrap yourself from poor conditions. I'm not saying everyone who is poor can do that; it takes hard work and, as I conceded initially, a bit of luck, but I'm simply saying it can be done. If I'm being downvoted for stating the obvious, so be it, but I have a feeling it's that I've hurt some privileged feelings here. If so, then good; everyone needs a dose of reality once in a while.
However, I think you are falling into the trap of identifying outliers and then trying to reason about the general case from it - it's pretty hard to use that to say anything more that "it's possible for X to happen, because it happened here, and here."