Of course, there have been quite a few criticisms of Mr. Giles's analysis of Piketty. It seems to have been substantially worse (my opinion) than Piketty's errors.
See [1],"FT journalist accused of serious errors in Thomas Piketty takedown", [2] "Have Giles and the FT gone too far in the attack on Piketty?" (where the answer is "..On most points, Piketty has answered the points in a reasonable (and to me generally persuasive) way.", and [3] Piketty's response to Giles.