Exactly. Water is stupid. It is not aware of what elevation it's at. Water held at 30 in-Hg on top of Mt. Everest will boil at 212F.
What does it matter? A boil is a boil. For brewers, as long as the boil temp is > 140F (the isomerization temp of alpha acids), we're just interested in the mechanical process of boiling - churning the wort, evaporation, etc. There's loads of world-class breweries here in CO and none give two thoughts to their boiling point. Mine is around 198F.
Shouldn't be anything different about digital or non-digital thermometers based on pressure. For any thermometer, at sea-level and a local barometric pressure of 30 in-Hg, they should read 212F at boiling in water.
Thanks. To be clear, I am not concerned about the boiling temperature of water or wort except in so far as it helps me calibrate my thermometers.