I think this person just learned about Vibe coding and is in the "Peak of inflated expectations" [0] as evidenced by this title: "» you can understand anything, now".

Understanding is not just doing. Understanding is being able to build something up from first principles. The author of this post will better understand the difference when he hits a non-trivial bug or the project grows past a certain size.

[0] https://en.wikipedia.org/wiki/Gartner_hype_cycle