I feel like as an argument, this isn't really saying a lot. There's an idea that markets, including the information economy that a stock market hinges on, are efficient, and thus, inaccurate pricing pretty much cannot exist. But if you remember that this is just a convenient oversimplification, you realize that stock markets haven't ever once reflected reality from, like, the day they were invented.

The article is also a bit lazy in arguing that an AWS outage should be bad news for AWS. To the contrary, this outage serves as a powerful reminder how commonly used, depended on, and entrenched AWS has become — traditionally, outages tend to raise stock prices of companies suffering technical failures. It's more curious that in this case, no significant change either way seems to have happened.

That's why Microsoft had to respond in kind.