Charlie is trolling. The architect isn't going to be the best craftsman, that requires very different set of skills.
Parity devs may be academically brilliant, and they put out a fantastic client, but the wallet issue shows how lax their development lifecycle has been.
I can't edit my post above to add this now, but looks like Charlie retracted this as Gavin was the original author, but not the one who made the mistake.
"If the creator of Solidity, Gavin Wood, cannot write a secure multisig wallet in Solidity, pretty much confirms Ethereum is hacker paradise."