From earlier in the very same blog post (emphasis added):

> This system does not perform gradual rollouts, but rather propagates changes within seconds to the entire fleet of servers in our network and is under review following the outage we experienced on November 18.

You jest, but recently I also felt compelled to stop using the word (planned) outage where I work, because it legitimately creates confusion around the (expected) character of impact.

Outage is the nuclear wasteland situation, which given modern architectural choices, is rather challenging to manifest. To avoid it is face-saving, but also more correct.