It's not a "simple" static site, and I'd be very surprised if it was "static" either, because there is guaranteed to be a database backend (how else would you track orders?). The frontend is written in EmberJS, probably with some fancy javascript backend.
I can rewrite any actual static site in Ember. That doesn't give it some magical dynamic properties it didn't already have.
I suspect what he meant was that it's not a site that requires or makes use of any client side wizardry. Even if it does, it certainly doesn't need to - it's a web fronted database; a CRUD app.
