He's not, because those locals will stop being able to speak English in a few generations. Either you'll have battery and signal or you'll point at things and make monkey noises.

What do we care what happens in a few generations? We'll all be dead, and the people alive will probably have universal translators implanted in their brains at birth. We absolutely won't need a "signal" to translate on a device anymore (that'll happen in just a few years, forget about generations), and there won't be anyplace on the entire planet that doesn't have network connectivity (that will also happen in just a few years; it's already reality with Starlink cellular).