The page mentions 4 categories of law which are pardoned. The first is https://www.govinfo.gov/content/pkg/USCODE-2011-title21/html/USCODE-2011-title21-chap13-

The page mentions 4 categories of law which are pardoned. The first is https://www.govinfo.gov/content/pkg/USCODE-2011-title21/html/USCODE-2011-title21-chap13-subchapI-partD-sec844.htm https://www.govinfo.gov/content/pkg/USCODE-2011-title21/html..., which covers the whole country. The next two are DC specific. And the last is specific to possession on federal properties. So no, the headline is not overselling the implications. If you simply possessed marijuana and were convicted under federal law, your case is going to be pardoned.