Patagonia do make high performance plastic products for activities where performance matters and in a better way than most, but have not been a performance focused company for decades. The original breakthrough of using plastic fleece in the wilderness due to it's non water absorbing properties doesn't really justify the size of their production with those materials today. They make most of their money selling plastic fleeces for people to wear to coffee shops. This segment of the market didn't realy exist before brands like Patagonia so they while they may offer a better alternative today, they are helped to create this particular problem.

And if you've ever seen their clearance lists, they're as bad as other fashion companies for overproduction - new colours every season which need to make way the following season.

Replacing plastics in their casual ranges and extending the lifecycles of the colours alone would make a bigger difference than a couple of research grants, but is risky for sales and less sexy. So take those statements with a pinch of salt.