From the article:
When we went to our seats, the wait staff let us know that despite the fact that the previews were playing, we wouldn’t know until the movie actually started whether we could see the film or not. If it didn’t work, the screen would just turn black. Luckily, the film went through without a hitch.
It’s not, because the statement is much more accurate in the case of internet-connected devices, and for emergency messages it’s enough to have someone around you who has one (e.g. a neighbour). I guess it would be really hard to find someone - in the areas where this change is made - who doesn’t have access to such a device in that sense, maybe even impossible.
It’s really more like assuming everyone breathes air because most people do.
