To be fair, newspapers aren't written for experts. That doesn't excuse a lot of crap from newspapers, but they're writing for an audience that isn't necessarily well-versed in all the subjects, for better or worse.
The point isn't that they should pander to experts. The point is that they're wrong more often than they're right; seriously, factually, inarguably incorrect.
I don't think he's referring to the fact that newspapers aren't written for an expert audience. I think he's referring to their routine inaccuracies and errors. That's what I get from it, being a expert who's cringed at quite a few press articles.
The errors aren't acceptable, but the inaccuracies are almost always because reporters try to dumb down a concept so much, that the concept loses all nuance. It's basically if Simple English Wikipedia were the norm.
