People write their sites in slow languages "because it's I/O bound anyway" and put content which could easily be static in a DB.
Then you’d almost certainly be overcomplicating things, but it shouldn’t be slow.
Database queries and interpreted languages aren't an issue at all. You need to be majorly unprepared to not be able to handle HN load. What I think people might overlook is that there will be other news outlets and social media that link to their website also. So it's hard to pass a verdict, though someone mentioned it's WordPress in a sibling comment so... I'd put my money on that it's poorly optimised but we can't really know I guess
Anyone competent can put a static site up on CF pages or even a lame VPS and serve huge amounts of traffic just fine. That’s not what they do.