See: https://news.ycombinator.com/item?id=17067350
But China shut that down and we haven't had a surge of western plastics in the oceans. They just go to landfills instead.
Much plastic also goes in garbage, not recycling. This doesn't end in the oceans.
I wish we'd move our supply chain off plastics for most things. But, the post you linked to isn't very persuasive on ocean plastic.
See: https://news.ycombinator.com/item?id=17067350