I believe the original comment wasn't written to say that he doesn't know how iPSCs can be useful (obviously they are very useful), but he doesn't know how this breakthrough/paper makes much of a difference.

He's getting at the fact that we've known how to induce pleuropotency for quite some time (I did some reach in this in orthopaedics in 2010), which is what the article title is misleading us to believe.