Hey thanks! This is a good clarification. I'm happy to modify my criticism from "the author is strictly off by a factor of 1000" to "the author strongly leads the reader to believe the size of the effect is 1000 times stronger than it really is, but he deftly avoids saying anything that's technically false, and in any case the reader shouldn't care about this since it represents an dead-weight loss of about $2 per person per year, which is less than the value of the reader's time spent reading this article".
