They don't exactly say they've eliminated it completely. The most relevant part of the interview and what you might be referring to seems to be this section:
Do you mean that, basically, wear is unavoidable as long as the parts are physically in contact?
Shiota: Yes, for example car tires wear out as the car moves, as they are in constant friction with the ground to rotate. So with that same premise, we asked ourselves how we can improve durability, and not only that, but how can both operability and durability coexist? It’s something we are continuously tackling.
Yamashita: The degree of wear depends on factors like the combination of the materials and forms, so we continue to make improvements by researching which combinations are less likely to wear.
They talk about improving durability but they still seem to concede that wear is inevitable. It's just about trying to make them less likely to wear or wear down very slowly.
It makes me wonder when they started making the change thought. I got the Animal Crossing Switch edition but I've been trying to avoid using the Joy-Cons much and sort of baby them as much as I can to avoid wear as much as possible myself. But maybe I'm being too overly cautious now...? It seems like any Joy-Cons bought now should see an improvement in durability from the sound of the interview because they also changed the way they tested the sticks so that is different from how they tested the Wii U gamepad sticks.