Not to say that the ad campaign is a winner, but this conclusion is dubious logic at best. A bad ad campaign is responsible for the revenue drop you say? Nothing to do the with the deep global recession and plummeting consumer spending? This type of stuff makes me hate pageview driven publishing.
The implication is that non-Mac PCs have had a greater share of high-end sells before the campaign, but it's not stated (some other places seem to back this up http://www.betanews.com/joewilcox/article/Apple-has-91-of-ma...).
The particular stat used (% of 1k+ sales) seems to correct for the recession; my expectation is that sales would decline evenly.
I would agree that this could be unrelated to ad campaign; I don't see any reason they have to be related.