The author couldn't even get through the first two sentences without being wrong. Credit card rewards are not funded by interest and this idea that credit card companies don't want you paying off your bill every month is retarded. The card issuer gets the majority of the interchange fee and makes a profit on every swipe even after accounting for rewards.
What analysis has shown that people are not doing this? All I have seen is that there aren't a significant number of convictions, but that doesn't really hold wait if you aren't actually trying to catch/prevent people from doing it. If it never happened, there wouldn't be a standard well known practice of casting a provisional ballot if you have already "voted".