This was referring to the pain I went through changing the code mentioned in this passage:
As soon as I realized that Noms could panic when calculating the hash of its types I knew I was way off. In the end I think I spent closer to 6 weeks on this. It was time-consuming, and boring, but it couldn't be automated and every one of the changes was an opportunity to introduce bugs.
You are right though, I didn't spend too much of the post talking about how much I hated that 6 weeks and how I regretted my life choices.