I think he meant hold down volume down + power button for 10 seconds.

Older iPhones with physical home button use that for restart.

Last year’s model.

Last year’s iPhones 8 use volume down + power for restart because home is not a button, but a sensor and it has to be powered to work.

there's no iOS 7 device without home button :)

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I think he means as software, infrastructure etc.