I mean, this is a "single file website" in the sense that `<iframe src="https://google.com"></iframe>` is a "search engine implementation in one line of code".

The only semi-interesting thing here is that this demo pulls dependencies from 3rd party registries via HTTP without an explicit install step. It's really not that different than doing regular Node.js development with a committed node_modules (hi, Google), except that if node.land or crux.land go down, you've lost your reproducibility.

The thing about "familiar/modern techonologies" seem like superficial vanity. A vanilla Node.js equivalent might look something like this

    import {createServer} from 'http'
    import {parse} from 'url'

    const route = path => {
      switch (path) {
        case '/': return home()
        case '/about': return about()
        default: return error()
      }
    }

    const home = () => `Hello world`
    // etc...

    createServer((req, res) => {
      res.write(route(parse(req.url)))
      res.end()
    }).listen(80)

Which is really not anything to write home about, nor an intimidating monstrosity by any measure. Serving cacheable HTML is really not rocket science, it simply does not require "the latest and greatest" anything.