The US has indeed exported slighlty more oil than imported in 2020 and 2021.
The big thing is the US (for the most part) is now in balance … importing and exporting about the same.
About 70% of US imports come from Canada (majority) and Mexico.
Much of the exported US oil originates out of Alaska. It is easier for that oil to go to Asia that US refineries (except those on the west coast).