The percentages in the article need to be compared to actual demographic percentages. To say that only 7% are Asian is misleading when Asians make up about 5% of the population. Same with the economic groups, "outdoors people" are not that far off the normal distribution curve.
Despite this criticism of the article, I agree with the conclusion based on my perceptions. My wife and I have discussed this many times on the trail. We can't quite figure out why this is the case, but we do sense a lack of diversity on the trail. I think its mostly an economic issue.
