I realize it’s not a reliable source, but not sure they would need to lie about VWs in Mexico.
http://money.cnn.com/2003/07/30/pf/autos/bc.autos.vw.beetle/
VW also has the following vehicles as a manufacturing aspect Bentley, Bugatti and Ducati Motorcycles. It also manufactures commercial vehicles in Germany. It also has 19% share in Suzuki Motors. If my memory is right VWs are manufactured in 153 countries.
Regarding the old beetle being built in Mexico, I have family that lives in Texas and they claim that VW is still manufactured in Mexico.