Watching it now. It's precisely what I thought it would be.
I will note that they have the word "intentionally," though I don't yet know how you can accidentally anchor a putter. I suppose if you have to choke up and punch out from under trees or something.
I don't believe it's specific to putters (though nobody's anchored their chips or tee shots or anything, so effectively, it is).
The Kuchar and Langer strokes are still allowed, but you cannot anchor the club, your hand, or your forearm to your body.