I did not really read the review, I am afraid to say. I had read reviews from other sites that had already confirmed my own admiration for Velodynes feedback subs.
I guess you young people have different terminology from us old folk. When I was growing up, car stereos had "slam", good home audio had "depth".
I think this goes to show that using such words can create contradictions if we all have different definitions for vague descriptions. I have even seen subwoofers with variable slam\depth controls.