Apart from that he makes some points about hacking of Coinbase servers, and I think this makes sense to an extent. There is a risk bitcoins are stolen, and if you trust yourself more with the coin than Coinbase's security team, then do it yourself. But many of us are far safer with Coinbase than their windows xp computer, Coinbase is very explicitly a user-friendly service catering to an audience with little or no expertise in cryptography or security. And given how much Coinbase stores in cold storage, I'd frankly not worried.