Presumably this is a blog. A static file server might've handled the HN hug of death without a cache.
Any other sort of "stack" is going to need caching, varnish, cdn, etc.
EDIT: huh, that site claims the JAMstack is exactly a set of static pages...
"With Jamstack, the entire front end is prebuilt into highly optimized static pages and assets during a build process. This process of pre-rendering results in sites which can be served directly from a CDN, reducing the cost, complexity and risk, of dynamic servers as critical infrastructure."
Looks promising. /s
[0] https://jamstack.org/