Did you read the article before commenting? The article proposes that Yelp should provide people the option to use their credit rating to prove they are not a sockpuppet in return for Yelp displaying their review. It is only an option, credit ratings are only used because they are a pre-existing identification and authentication source and most importantly YELP IS NOT DOING THIS YET.
As a matter of fact I did, and you're right: I mis-read the parent comment as present tense vs. potential future tense. My apologies.
That said, I think some of the problems with the credit report solution still stand; namely that pulling credit histories has a cost (both to the reviewer and to Yelp). I would worry about what they would do with that information beyond merely authenticating me as a "real person" and I would expect that fewer people would be willing to review a local donut shop if doing so required a credit pull.
