McAfee is probably getting paid to hype up different altcoins. He does not care about anybody but himself so I would be very cautious if you're taking his "advice".
He's clearly a double agent, if he's being paid then his investment has doubled or tripled after he's dumping all his investments like pulling out all the money of investors and leave them no choice but to hold.
That's the worst thing will happen if people will try to listen his shit concerns.