Not much to explain, you're absolutely right. Hetzner would have been a much wiser choice here, but advocating any cloud provider at this scale probably has its perks too or he wouldn't be burning his money. Then again, perks only go so long and at some point do come to an end, so this is why he may be writing about costs right now.

Take a look at their datacenter in Germany: https://www.youtube.com/watch?v=5eo8nz_niiM