I do not disagree with that point but that does not mean the headphone has to sound as terrible as it measured.
This suggests good deep bass (well extended) with some 'punch' (100Hz-300Hz elevated a bit), good clarity (1kHz to 6kHz following the curve on average, and some extra treble and treble extension without a lot of peaks/dips. At least ... above 6kHz it becomes a crap-shoot anyway.
I can see why this headphone may not sound 'bad' at first listen even though the dip at 500Hz would give some 'hollow' sounding coloration to voices.
Would I prefer it over another headphone ? Most likely not. Still may sound 'impressive' and pleasant to some.
Product variance, differences in fixtures, as it is closed it may sound different on the head than on a fixture.