How often are there routing issues to Google, but none to your site? It's much more likely that your site will be unreachable. The probability that Google will be down is probably insignificant for most cases.
It did not happen for very long (a few minutes each time), and not often, but it has happened.
Routers are configured by people, and people make mistakes.
He's not claiming that Google is infallible. I'm more confident in their ability to maintain availability than yours. All of this paranoia about Google going down is mostly FUD.
I wouldn't say this whole issue is FUD though. For instance I would not want to depend on four different even high quality third party sites for each request to my website because the likelyhood of failure would be (almost) five times as high.
OTOH if your site is down, it's fully down - no partial content, and javascript errors.