If you would read the paragraph directly after the list of instances tested you would see this was directly addressed. This test wasn't meant to mislead and was simply exploring the best options for us. This isn't the same for everyone, which is why we open-sourced the tool we made so that you can run your own tests as well.
karmakaze|7 years ago
This is the part that doesn't make sense. They basically chose one type from each vendor, before benchmarking. If there are clearly instance types at twice the cost and still lower than types from other vendors, the results were stacked. How can you see this any other way?