This article is from 2013. I have never heard anything about this.
This isn’t a big secret. Any local trash pick-up will give you a pamphlet or something that tells you what the recycle place really will accept. Many of these recyclable items has that little triangle on the bottom of it and it has a number on it. I believe my place will accept stuff with a #1 or #2 and maybe a #7 or something but will not accept any of the other numbers. You’re supposed to throw those away. The same goes for “printed cardboard.” You can recycle cardboard but if it’s got printing on it (like a cereal box or pizza box) it’s no good and they can’t reuse it. So you throw those out too. Though the article putting the blame on China is a bit silly…
And, yeah, I believe the dumpster diving. Places throw out stuff for the dumbest reasons, especially if a customer returns it and says it’s broken…they don’t have time to test it and can’t put that back on the shelf and many manufacturers don’t “take back” stuff, so they toss it. Of course, I’m pretty sure it’s illegal to dumpster dive, many places have cameras and all the time to sell stuff would be a pain. But to each their own.