  It has been pointed out in arXiv:2211.17057 that our recent (published) paper
might be revised, due to an incorrect evaluation of the diffusion coefficients,
$D(E)$, employed in the calculations. Unfortunately, there is no indication as
to where the incorrectness might be. Here we offer the opportunity to be more
specific, by providing the community with the whole description of the
equations involved in the calculation of $D(E)$, which is missing in the {\tt
arXiv} note. In this context, we mention that no \textit{ad hoc}
parameterisation has been used in our paper. Furthermore, any assumption on the
injection mechanisms is explicitly described in the paper as an input factor
and is obviously part of the modelisation procedure, hence the final outcome is
subject to it. Finally, we discuss in a more broad context what, in this
calculation of the diffusion coefficient, we believe is the key message.
