They presumably were shipped from Taiwan To the US where these rules do not apply.

This rule only applies to goods manufactured in Taiwan and shipped to China.

China is Taiwans largest trade partner. For example, 33% of its steel is from China (Taiwan being in the top 7 steel importer, in the world). With Harbor Freight being the destination, it's not unlikely that 90% of the materials in those tools are from China, including a good majority of the standard cogs, switches, and doo-das within.