Trading is in heavy divestment mode, not accumulation. You can't say something is continually in accumulation mode at every step of a downtrend.
Also those coins he trades... I've never heard of them have you?
Steem isn't tradeable in volume, if you buy it to trade a bit with size you can't get out without pushing the price down a few percentage points. It's illiquid, not tradeable.
He's right about forcing people to pay lower prices though. I'd be careful about assigning authority to 'traders' without actual proof.
RE: A Chat With A Top Steem Trader…….. Steemians Speak - Has Steemit Met Your Expectation?....... This Week On Steemit…….. SteemMag – Steemit’s Weekend Digest #25 p.2