I didn't see it, but I agree that's illegal based on the description.
However, that got me thinking, when is that play dead? A try is dead when it is apparent a drop or place kick will not score. An illegal kick cannot score, as only drop or place kicks can and those are defined as being legal kicks in Rule 2. However, being illegal, it's therefore not a drop or place kick and the ball remains live, even if it was blocked. K could recover the blocked illegal kick and advance it into the end zone -- where the illegal kick penalty would force the try to be replayed.