> "apply STIR/SHAKEN caller ID authentication to, and perform robocall mitigation on, all foreign-originated calls with US numbers,"

This won't affect anything that is actually a foreign number (which wouldn't be used for robocalls anyway as people wouldn't answer it, with the exception of some Caribbean countries that have three digit area codes instead of the typical +CC format). It will just block foreign phone companies from pretending to have US phone numbers, which seems like it should have been done long ago.