A lot of it is not mine to share, I was basically a CXO hire brought in by Skyler Hartle and Brian Habersberger who created it* to work with them on assessing the viability of the product they'd built behind the scenes, as a business, and it's levels of scale etc. Skyler and Brian are amazing genius level dudes (and also HN users!). I know the whole story end to end, pretty much exactly as it unfolded, it's not really anything like this blog post thinks it is, to the point I don't think I even agree with the author. Again: I'm sorry but much of it is not mine to share, for a great many reasons.
*As a side project, over years, and years, before it took off, "over night", there is a lot of tech unmentioned they built totally unrelated to LLMs etc, much of it still worth, not mentioning, because it's "cutting edge" still even today)