I would have thought that if you can follow what's going on in good detail during a quiet passage and then get startled by the sudden onset of a very loud part, which is also reproduced cleanly with nuance, you have both micro-dynamics and macro-dynamics covered. For a headphone to have "no" macro-dynamics, the quiet and loud section would have to have the same volume, strictly speaking. Taking it less literally, maybe it would mean that you're absolutely not startled when there's a sudden increase in loudness, say a big bang or some bass drops. Marian Hill might be good to test the letter, lots of snappy, abrupt, sudden sounds. I would expect that to sound muddy, weak and muffled with a headphone lacking in dynamics, since it's too quick of a change for it to keep up.
But, uhm, that does not in the least sound like what I'm used to from the Ether Flow and Ether C Flow. Not to so say it couldn't be better, possibly, but I absolutely don't understand what he means by no macro-dynamics. In fact, I had to get used to listening at a lower volume after getting the Ether Flow because it did have an exciting intensity without cranking it. Previous headphones required more volume - but even that I wouldn't call "no" macro-dynamics.
I would have thought that great impulse response to also indicate great macro-dynamics, so to hear this about the Stealth is even more surprising.
But that illustrates one of the issues with reviews and this hobby in general, we never all met, perceived an acoustic phenomenon at the same time and agreed on a name. Rather we have possibly differing intuitions about what a term means (say, musical, dry, forward, ...) if any (Plankton? What? Luckily I read a definition later.) and can really talk past each other.
So since what he's saying makes no sense to me at all, it has no impact on my purchasing decision. His palpable sense of confusion about something happening in the room instead of being reproduced by a device on his head is however very exciting.