This is the only person I have seen say this so I can only guess no one is repeating it but it appears to be correct when I checked a few countries.
Its fucking insane to think Cambodia has a 97% tariff, and he thinks they are getting rich off of it.
Trump sees trade through a mercantilism lens. Any trade deficit we have is bad by default and the deficit is how bad we are "ripped off" by importing that countries goods. The only way to "fix" the imbalance is for them to import more of our goods.
Its rooted in the 16th-18th century so its totally the best system