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We have shown (Colin et al., 2019) that the acceleration of the Hubbleexpansion rate inferred from Type Ia supernovae (SNe Ia) is, at $3.9\sigma$significance, a dipole approximately aligned with the CMB dipole, while itsmonopole component, which can be interpreted as due to a Cosmological Constantor dark energy, is consistent with zero at $1.4\sigma$. This has beenchallenged by Rubin & Heitlauf (2019) who assert that the dipole arises becausewe made an incorrect assumption about the SNe Ia light-curve parameters (viz.took them to be sample- and redshift independent), and did not allow for themotion of the Solar system (w.r.t. the 'CMB frame' in which the CMB dipolesupposedly vanishes). In fact what has an even larger impact on our finding isthat we reversed the inconsistent "corrections" made for the peculiarvelocities of the SNe Ia host galaxies w.r.t the CMB frame, which in fact serveto bias the lever arm of the Hubble diagram towards higher inferred values ofthe monopole. We demonstrate that even if all such corrections are madeconsistently and both sample- and redshift-dependence is allowed for in thestandardisation of supernova light curves, the evidence for isotropicacceleration rises to just $2.8\,\sigma$. Thus the criticism of Rubin &Heitlauf serves only to highlight that "corrections" must be made to the SNe Iadata assuming the standard $\Lambda$CDM model, in order to recover it from thedata.

A response to Rubin & Heitlauf: "Is the expansion of the universe accelerating? All signs still point to yes"