Actually, he is correct. The Ma Bell breakup in the 80s is a good example of this. The newer, smaller companies grew much faster than the original.

That would be ridiculously difficult to enforce. Also, most manufacturing, American or not, is already done in metric. It would be trivial for companies to swap units. There are many, many better ways to tariff American goods.

The purpose would be to make it very irritating for American companies to bend to the rest of the world’s standard,

OP, I think you’re Canadian, so it might be a bit of an exception but in most countries that use metric, American companies already sell products that only use metric unit. This would literally change nothing.

In case you want the actual link https://youtu.be/s2TyVQGoCYo