Because some of these comparison modules are measured with/without their output filters insitu, and the manufacturer has used Audio Precision "very high order" external “test filtering” instead for the graphs, and/or the frequency knee of the output filter they use if used, is totally different to the one it's being compared to by the one doing the comparing, which will directly effect the amount of phase shift down lower in the audio band as those of us all know.
@jesskerry
I only know of one person who could put together such a long sentence that in the end is so convoluted that it cannot be proven or disproven. I would try to answer it, but it is the opposite of building an argument from parts that logically form a whole.
Hahahaha.