Sure, that could be the eventual goal. But for that to happen, we need to ramp up manufacturing in thousands of sectors: not just the device, and not just everything it contains, but also the machines that make each of the components, the machines that make the parts for those machines, the raw materials for each...

If this was a serious economic policy, it would have started small—perhaps a 5% tariff, to take effect in six months. Then, promise to ramp it up (say an additional 5% every year).

Also, it's a weird way to do "hidden" tariffs, in addition to the official ones that are bad enough.

E.g. if he wanted to tariff electronic devices, why not tariff them directly, instead of those weird mental gymnastics?