These situations are almost always self-inflicted. If someone else hacked Google Cloud this badly then you'd likely have heard it from them first. And they probably would have done something significantly more destructive if their goal was harming Google reputation.
“Unprecedented” is kinda hot right now. Tries to mitigate too much blame being heaped on: “obviously we prepare for the usual and even the unexpected, but this has literally never happened before (give us another shot pls)”.
So it’s interesting for the news that it takes on a different context when said breathlessly: “UNPRECEDENTED failure!”