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We argue that the recently published CLAS results on the deuteron spinpolarizability $\gamma_0$ [Adhikari {\it et al.}, Phys.\ Rev.\ Lett.\ {\bf120}, 062501 (2018)], as well as their comparisons with chiral perturbationtheory ($\chi$PT), are misleading. In reality, the deuteron polarizability islarger by 4 orders of magnitude, as demonstrated here by a novel calculation inpionless EFT. The CLAS paper, on the other hand, presents only a tinycorrection to it, based on a partial evaluation of a sum rule for $\gamma_0$.The sum rule is assumed to have the same form as for the nucleon; we argue itdoes not. Moreover, their "test of $\chi$PT" tacitly involves assumptionswhich, as we demonstrate, may not be valid at the claimed accuracy.

Comment on "Measurement of the $Q^2$ Dependence of the Deuteron Spin Structure Function $g_1$ and its Moments at Low $Q^2$ with CLAS"