It's not unreasonable to expect that the last two digits of the voting counts should be distributed uniformly. Given that we also know that the wiring in human brains keeps us from properly sampling a uniform distribution by hand, the article employed a simple strategy of looking at the last two digits, assuming they were drawn from a uniform distribution, and asking if that were so, what is the probability that this would be our draw?
You gave no reason to be skeptical, and simply illustrated your lack of familiarity with basic tools of probability. Funny that you would below speak of a "stunning example [...] of mathematical ignorance." If you wanted to substantively contribute to the discussion, perhaps you should try explaining why this was an invalid test instead of just labeling the authors as "numerology detectives?"