Comment on "Transition from Bose glass to a condensate of triplons in Tl${}_{1-x}$K${}_x$CuCl${}_3$"

We argue that the interpretation of the calorimetric data for disordered quantum antiferromagnets Tl${}_{1-x}$K${}_x$CuCl${}_3$ in terms of Bose Glass physics by F. Yamada {\it et al.} in [Phys. Rev. B {\bf 83}, 020409® (2011)] is not unambiguous. A consistent analysis shows no difference in the crossover critical index for the disorder-free TlCuCl${}_3$ and its disordered derivatives. Furthermore, we question the very existence of a proper field-induced thermodynamic phase transition in Tl${}_{1-x}$K${}_x$CuCl${}_3$.