I asked my astronomy teacher about this a week ago and told him the same thing you said- I asked him if it would be any harder to find concentric pentagons (if that's what they're called) in the WMAP since it is such a huge data set. My teacher told me that he didn't read the paper, but one of his grad students read it and pointed out that the man doing the analysis of the data didn't account for the probability that those patterns would be there anyway, apparently a common mistake. I wish I knew the proper term that he used, but the semester is already over.