  The article of Pastore et al, while proposing an interesting and potentially
useful approach for the generalisation of Quantum Monte Carlo techniques to the
treatment of the nuclear electromagnetic response, features an incorrect and
misleading discussion of y-scaling. The response to interactions with
transversely polarised virtual photons receives sizeable contributions from
non-scaling processes, in which the momentum transfer is shared between two
nucleons. It follows that, contrary to what is stated by the the authors,
y-scaling in the transverse channel is accidental.
