We see this type of post regularly. Something like, "How I built a better <pick your app> clone by myself in a month." Well, no, usually it's just a bare skeleton with the least amount of functionality. Not only that, the software is the least of the functionality. The organizational structure around the app is what matters most to keep it going. It's an attention seeking ploy and the whole thing usually disappears real quick.
If you want background, you can go to the blog in his bio and read the first post, which mentioned he worked at Twitter starting in 2011. He mentioned elsewhere that his comparison is early Twitter, as opposed to current Twitter.
The background makes this a bit more interesting, because you can imagine how those early days impacted the arc of his work.
