They used a 0.25 constant in a formula and the article is arguing they should have used 0.945 instead (difference of ~4x). The constant the Trump administration used seems to have been the one for estimated effect of tariffs on retail prices (ie, consumer facing) and it was more appropriate to use the one for the effect on prices at the border.
I assume that is similar to me being a computer company importing chips, a 25% tariff on microprocessors will make the imported cost of microprocessors go up by ~24% (because some really expensive ones don't get bought) but it would increase the price of the computers I build by ~5% because most of the computer isn't a microprocessor.
It is an exciting time to learn about the country of Lesotho.
I assume that is similar to me being a computer company importing chips, a 25% tariff on microprocessors will make the imported cost of microprocessors go up by ~24% (because some really expensive ones don't get bought) but it would increase the price of the computers I build by ~5% because most of the computer isn't a microprocessor.
It is an exciting time to learn about the country of Lesotho.