They might have been using stock...or the mods that are outlined in the Innerfidelity article. Which as I understand is different from Anax 2.0.
You need to make the treble EQ much higher Q. You want to kill that 6k peak, not bring down everything
When they showed the EQ on Bob's laptop it looked like the db decrease was from 6k and up. It was probably just "zoomed in" on a spectrum of 10hz - 6 or 7k.
Regardless they used some kind of anax mod. They said that they did, but never specified which one, not in the article and not in the video. Doesn't matter, I was just curious.