Comment on Perez et al [PRX 2, 041005 (2012), arXiv:1209.2011]

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Recently Perez et al [arXiv:1209.2011] wrote on the spectral slope of MHD turbulence claiming that it is consistent with -3/2. This work contains a number of errors, factual inaccuracies and puzzling methods in the interpretation of numerics. We argue that the numerical evidence that the authors presented is actually against -3/2 slope and the assumption of universal alignment, opposite to what they claim. Perhaps the most puzzling is the Fig.8 that claims that the authors measured the inertial range length and that it is consistent with Re²/3 scaling. At a close inspection it appears that the datapoints are not the result of a measurement, but rather were calculated by a formula.