I switched from windows/.net/SqlServer to linux/mono/MySQL two years ago and in a single server I handle among many many other things 10k-20k reservations/day.

The server is a small dedicated machine with 8 cores and 16GB ram but never goes beyond 30-40% cpu and 2GB ram. This in Hetzner for about 60€/month.

So I don't understand what the author finds so amazing about the numbers he posted.