Howard Reed has gone through the data sources and he agrees that "it's all about the discontinuities", "it" being the critique of Piketty. This is one of the best commentaries on this argument that I've seen yet. He does a great job walking you through the problems in Giles's work. What's more amazing is that Giles seems to recognize the difference between what he did and what Piketty did, but he does not recognize it's significance.
btw - some comments by Phil Magness on Facebook suggest he doesn't get this point either.