He was not.
The south part of Holland was liberated in 1944, the northern part had to wait until May 1945. Leerdam managed to work all through the war and was supplied with electricity long after the rest of the country went dark. Leerdam were important suppliers of food containers to the Germans. The war is best not mentioned at all, lest something unsavoury fall out of the closet. And as for "had to go into hiding", I have yet to hear from whom.