> It seems pretty clear this would prohibit the sale of 3D printers that are not approved by the California DoJ.

Note the difference w.r.t. the ridiculous "California's New Bill Requires DOJ-Approved 3D Printers".

I still don't see what's you're saying. California's bill is requiring their DoJ to approve 3D printers for sale or transfer within the state of California.

I wonder what your first language is.