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The bottom line is that EM is responsible for what it puts on the site as fact and there is no proof that increasing tire pressure past the placard spec will increase traction. Just take it down already. I don't understand why EM would feel the need to say anything about wet traction anyway, many people here seem to feel it's a question better left to performance driving forums.
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There's also no proof that increasing tire pressure beyond placard decreases traction to any significant degree. If you're worried about traction so much, you're going to be running soft tires with poor rolling resistance anyway.
My tires wear substantially at the edges at placard pressure. This is the case on at least six vehicles that I've owned over the last 10 years, from my '99 Metro to my '85 F250. Since airing up the tires on my three vehicles to sidewall pressure on two cars and a truck, the tires are wearing much more evenly. Higher tire pressures have contributed to over $1,600 in fuel savings over the past 2 years, and my tires are lasting longer because I'm not throwing them away with bald shoulders and tread left in the centers. The suspensions on both cars are both still fine after 100,000 miles, so I guess I'm not concerned that I might have to prematurely spend a whole $200 on replacement struts for my Honda.