re: Hum sure...
Did you chance to read the Space.com article?
Got a couple questions for you.
What number of meteorites just re-impact on Mars?
And how many just have enough energy to enter orbit?
First, I suspect if what these guys are saying is true the re-impacts create more orbital debris than they produce Earth bound materials.
Second, they don't talk about orbital debris at all so we need to guess at numbers for it and it should be as high if not higher than extra-Martian materials.
Again I think you have found an article that argues against your claims.