I spent ~$1500 (and a bit more than two months) building a compiler that translates typescript to native binaries. I think I'll be able to do a Show HN later this month. It's the best $1500 I've ever spent on anything related to software development or computers.
You're not addressing the idea in the post, but the person. What the author achieved personally is irrelevant. What's important is that a very large and important industry is being completely transformed.
Add: if I did it without LLMs it would have taken me a year, and would have been less complete.