Good to see that even Zeiss photograph nerdy resolution charts in their back yard. That makes me feel much better.
Actually, the Zeiss spec. sheets I have seen give MTF curves at scales like 10, 20 and 40 lp/mm for its medium format lenses and not maximum lp/mm data. So this 300lp/mm + "extinction resolution", at which fine high contrast lines are reproduced with about for stops less contrast than reality, seems to be of interest only to their marketing department. (Such measurements might be of interest in astromomy, aerial surveillance photography and other technical uses, but not to photographic art as far as I can tell.)