Although the artical does say that the upper portion of LEO is the biggest problem (only because I'm splitting hairs).
I was trying to look for it, but couldn't find it...but... it was a chart that showed orbital decay rates for various altitudes. It made me think that the lower LEO is not an issue because the decay rate is in the low decades, and its the somewhat higher orbits that take a long time to decay that is the problem. But without the chart, I can't remember where those points were.
And where the ISS is, it seems almost self cleaning (although still a problem). I believe that's one of the reasons it is where it is, and I infer that from this chart.