I think this is an interesting note at the end, it's clear that the whole "conversation" hasn't been posted, and not clear how many prompts were needed to finish it. A proficient developer would be able to develop this same app to the same level (once they have the idea) in a couple of hours without ChatGPT too.
It would be super interesting to see a full screen recording of the process (or a similar one). What was the total word count of all prompts, how does that compare to the code size?
Don't get me wrong, this is incredible and inspiring (I'm regularly using ChatGPT and Copilot). But I think the post doesn't critically analyse the process well enough.