The article on mechanical watches had so much depth and such good explanations I thought he was a mechanical watch engineer or enthusiast who happened to also have web design, 3d animation, and writing skills
He does :) hope he doesn't mind me sharing from his Patreon:
> I myself don't even own any traditional watches, so the topic was very new to me. Thankfully, it was easy to understand the gist of how mechanical watches work just from watching some YouTube videos and I decided to give the topic a go.
If you subscribe -- you should subscribe!! -- you can read his "making of" posts which are also fascinating. I don't think he's a domain expert in anything he's written about, he just does a ton of research and only produces a few articles per year.
He has an commentary article on Patreon where he says he doesn't even own any traditional watches, and had to buy a movement to take apart and understand