Doesn't the minner have all the power in this chain? A 51% attack is there much easier to perform.
By "attacking", I mean they'll buy your coins gratefully from your hands to increase their shares. When own the majority of the bcashes, if they pump their coin artificially, it will be them making money. Not you, or anybody who instadumped. And many clueless people will fall for that fake pump.
I believe the point he was trying to make is that with little mining power BCC will be so easy for a group of miners to kill by double spend attacks.
The reality is that BCC isn't going to be very secure.