The fact the pesticide is already in soil doesn’t impact whether the U.S. practice of making the pesticides and sending them to other countries hurts the U.S. We still have reason to think the U.S. practice of making/exporting the pesticide hurts people in the U.S.

We still know that the banned pesticides are among the ones the U.S. makes and exports. There may be other pesticides that are not banned; the argument isn’t concerned with those.

This raises the possibility that the pesticides used on the imported products are coming from another country, not the U.S. Multiple countries may be making the same kinds of banned pesticides. So, we cannot assume that stuff sprayed on the products had a U.S. origin.

Even if they pose a greater risk to people in other countries, that doesn’t suggest that might not also increase the health risk to people in the U.S.

The argument concerns the pesticides banned for use in the U.S. Whether those pesticides are banned in other countries has no bearing on the level of danger posed by those pesticides.