This is like a modern form of "I could do that in a weekend". Try reading the article before making such statements.
There's a lot of pre-processing, experimentation and validation that went into this project. The training data collection and sanitization alone is a big undertaking.
As for the blog post itself, from the article:
> Note: This blog post is 100% written by me. No AI has been used whatsoever.
Put another way: You can ask the LLM yourself to do this project? Please do, share your prompt, I'd like to see it.