I thought the article referred to the Métis people, one of three indigenous cultures mentioned in the Canadian Constitution. It took a few ticks to realize that it was using "metis" in another meaning.
In Greek mythology, Metis is Athena's mother. As an descriptor, it means cunning.
I had a copy of D'Aulaire's Book of Greek Myths as a kid. My favorite illustration was the full page shot of Athena busting out of Zeus's head in all her armored glory.
And in this context (I think inspired by James Scott's Seeing Like A State), it refers to local knowledge that isn't necessarily obvious to outsiders. Think of something like "you have to build in retry logic because that API tends to fail every fifth time."
I have read a lot of Metis history, and this passage struck me as oddly appropriate, although unintentionally so: "the practical wisdom that comes from being a tight-knit community sharing a common goal, watching each other succeed or fail, and passing down lore to the next generation."
Same, I was hoping to find an article about some kind of little known bodybuilding metis subculture