ColourOfSpring - 3:30 pm on Apr 4, 2013 (gmt 0)
Matt Cutts said that the link from the seller site will not pass PR and not hurt or help a site that did not pay for a link. He did not say that Google would not issue a penalty on the site buying links.
Well he did say that the link selling site's links (plural) would not pass on any PR (just watched the video again) - that's open to interpretation. You're right in that it could be a verbal sleight of hand by Matt Cutts (not the first time). He should come out with a video to clear all of this confusion up :)