Not really.
I didn’t “work the AH like a boss” myself. I was buying and selling stuff, but I wasn’t some TSM master, and I still managed to make some coin there.
Mostly I spent my time on ALL of my max levels farming HFC and BRF weekly, then repeating every Tuesday at reset.
It just takes dedication, which most of these people obviously didn’t have, or they didn’t bother to focus their efforts and tried to get it organically which obviously would have taken forever.