So around 2.3k HPS monthly average. Assuming an average peak is 10 times that, 23k HPS seems a little little high but doable for a handful of servers (after load balancing and caching come into play).

One note says "everything is dynamic, nothing is static" which sounds weird if they're using Akamai for anything but images. Images are claimed to be served at 100K HPS, which would be difficult for a handful of servers, especially with the dynamic content on top of it. It comes down to caching and hardware as usual.