Not only that. I think most of us, including the author wouldn't have thought this was actually feasible.

Not only is the time and dollar spent lower than a lot of people expected. We could now foresee a lot of these human interaction, mistakes, time and cost could be further reduced by a factor of 2, 5 or even 10+ in the not far future.

Also worth taking into account what is stated in the blog post is also acting as PR piece for Claude and LLM in general.