Yes, that is the jist of the last sentence. However that was clearly not the message the bulk of the post was intending to express:
He [Charlie Miller] did mention, in his interview with Ryan Naraine, that Chrome was pretty much in another league. Their 'sandbox' makes it extremely difficult to exploit
Two hikers are running from a grizzly. One of them asks, "Do you really think we can outrun the bear?" The other says, "No, but I think I can outrun you!"
It would still take two successive holes to exploit - one to get in, another to get out of the Chrome sandbox. And only 7% of users use Chrome, while 56% users use Firefox (my own web site statistics today ) - If I wanted to do something malicious, I'd get a lot better bang for the bug with Firefox.
He [Charlie Miller] did mention, in his interview with Ryan Naraine, that Chrome was pretty much in another league. Their 'sandbox' makes it extremely difficult to exploit