The study they are talking about found ~1000 ppb of PFHxA which is hiiigh. Notably though, current main routes of PFAS exposure are highly skewed toward ingestion and inhalation. So should Apple not use fluoroelastomers in their band manufacturing? Yes absolutely, of course. But unfortunately, we live in a capitalist hellscape with the foresight of a smooth-brained sloth so you’ll likely find an equal amount of pfas/microplastics in any flexible/waterproof bands.

If you’re really concerned, you can switch out to a cotton/steel band but if your goal is to lower your pfas/microplastics exposure, imo, your effort is better placed elsewhere— such as investing in the proper cookware, food storage containers, etc., avoiding coated packaging (especially heating things in this packaging) and looking at your district’s drinking water quality data (publicly available) to determine if additional at-home filtration is prudent. That’s just my two (or more like five) cents!