It's helpful when you are criticizing someone's article to provide a link so we can see exactly what was asserted so no straw man arguments are made.
That said, if there is a reviewer suggesting that the Stealth is lacking in dynamics, I would suggest his amplifier is lacking in power. They're Dynamic.
It’s not reviewers, it’s attendees from CanJam, the main thread at head-if, and some reports at SBAF. It’s pretty much for certain very few of these situations are underdriven, esp any rigs at CanJam where the criticism is most acute.
I don’t think any professional reviewer has made this claim. But it’s pervasive in discussion threads. I don’t think I’m exaggerating to say at least a few dozen people have said something along these lines.