Earlier quoted context omitted.
This is the only thing that makes sense. What if your battery is dead? Not having access to the menu would be ridiculous.
Not quite the same thing, but I had to head home early one night recently because my phone had died (which almost never happens to me) so I couldn't show vaccination-proof. I would guess that a person's phone dying while bar-hopping is much more common than dying while dining alone (since when dining with others, you can just look at their menus). You're not wrong that this fundamentally excludes those who don't have…
I'm in Canada, and we use QR codes, signed by the government, to show and validate status.
Mine is printed out, and in my pocket. No phone is required.
Thus, no one needs to avoid anything, phone or not.