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.