Both my parents are MENSAns. I agree with the parent poster, there isn't specifically anything special about being a 95%ile, and most of the members of the 95%ile that have joined MENSA aren't massively successful, any more than anyone on the middle of the bell curve.
It's not, what you have. It's what you do with it. I struggle with some things my parents find easy, vice versa, most of the 95%ile that I know have various mental health problems or other hidden disabilities that make daily life difficult -- especially achieving something like this.
And Feynman went far with being just an ordinary person supposedly slightly lower on the bell curve.
The only thing that actually tangibly matters is dedication and sweat, and how much time and effort you're willing to put in to something.
Of course, that's not to outright say that an IQ test or however you want to measure cognitive "capital"* isn't valuable in some aspect -- it does measure something, after all. Less fighter pilots died in training once they started selecting using early IQ tests (Source is a psych book from the 80s I skimmed a few years back :P). But that's an extreme case. For projects like this, for most of the things you will ever, ever want to do, it outright does not matter and the emphasis on it in programming and "intellectual circles" (on the internet, I don't think anyone in real life actually gives a shit outside of college admissions) is massively overblown.
* - I'm phrasing this in capitalist terms explicitly because "cognitive capital" is an explicitly western construct that to be honest seems to be more detrimental than it has been positive. Also, outright racist in the historical use and implementation.