Even if it were a tax paid by foreign companies, what difference does it make? They would just increase the prices the goods are sold at.
So, lets say, a smartphone that is priced at $1000:
With the 20% tariff in place:
If the Chinese conpanies pay the $200 per device, they just sell each phone at $1200 to the US importer.
If the US importers pay the $200 per device, similarily, they would tack on the $200 (on top of the usual markups), making it $1200 per phone.
There is zero difference, the end consumer always foots the bill.
This is so simple to understand, how are people this stupid