[N0B0DY]

No you're not wrong unless you're referring to the doppler effect. The argument is against the big-bang cmb and can be, though doesn't have to be, against expansion.

The latter is my own inference based on what you are questioning, which is what the paper is about; the cumulative negligible effects of the vacuum within the atoms producing the same effect as the doppler effect. The emission shift is lesser because it is accelerated, similar to the acceleration within the vacuum tube of accelerators.