They probably also contribute to microplastics pollution when the clothes slowly break down during washing.
Intentions don't matter anywhere near as much as results.
In the real world, you get rewarded only for achieving results, not for trying.
Plus they're actively working on the microplastics problem: https://www.patagonia.com/blog/2017/02/an-update-on-microfib...
In regards to their product, they make high quality clothing that lasts longer (reducing consumption) and sheds less.