Tapu Village is a very small settlement- in many regards, this is basically a glorified Route Pokemon Centre. In context, one gets the impression this used to be a lot more expansive a location than it now is, but at this point, the only indication it's a location is the name.
That's certainly one reason. I thought they were going to mention the other thing, though.
Yeah, Kukui told me about it. It's really something, though, to see the entrance to this place in a village like this.
The Elite Four are incredibly important people in the world-building, being stronger than the Gym Leaders and forming part of the onslaught of the Pokemon League Challenge. At the same time, though, they are also traditionally Pokemon's least developed characters, with every region including at least one member who doesn't appear until the player attempts the League Challenge, and usually multiple- in fact, it is often the exception to see Elite Four members outside the League Challenge.
Galar may have been onto something when they decided not to bother.