Not all their matzes are kosher for Passover but they do have a kosher for passover production. You should look on the packaging for the letters ORT. Those letters stand for Onder Rabbinaal Toezicht, meaning it was prepared under rabbinical supervision and are kosher for passover. See also on the website of Hollandia. https://www.hollandiamatzes.nl/en/passover-order/opperrabinaat/
