We are yet to have a fully vibe-coded piece of software that actually works. The blog post is actually great because LLMs are very good are regurgitating pieces of code that already exist on a single prompt. Now ask them to make a few changes and suddenly the genie is back in the bottle.
Something doesn't math out. You can't be both a genius and extremely dumb (retarded) at the same time. You can be, however, good at information retrieval and presenting it in a better way. That's what LLMs are and am not discounting the usefulness of that.