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wtf?! is this true of 5s as well?

I think there's a hardware component required. Unless it's only in a beta OS, I have and Xs and I see a different wording for that setting. Mine omits "and powered off."

Why? wouldn't it just be a matter of activating a low-power mode and turning off the screen? It's been said a long time that this is done by certain malwares.

I found an article that specifies phone models and explains why[1]. It's iPhone 11 and 12 because it requires a UWB/U1 chip. This thread (via Craig Federighi)[2] asserts UWB isn't the part that's used, but those phones have a newer Bluetooth chipset.

[1] https://beebom.com/how-find-lost-iphone-turned-off-erased/

[2] https://www.reddit.com/r/iOSBeta/comments/otcn02/iphone_rema...

Your hardware needs a low-power mode to activate, before you can activate it.

All of the iPhone “off” features, like express transit cards and find my use dedicated low power hardware that seems to be capable of running the feature without an active CPU telling it what to do.

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