Health, you are arguing from the converse. Saying that being the az is a type of kefira means that all kefira is az is like saying that the fact that cats are animals means that all animals are cats.
BT, I have often suspect that the pashkevillim were put up by Leftists in order to discredit the frum community. BTW, a former Yerushalayim city councillor from Meretz who left said that she became disillusioned when representatives of a Haredi party came to the office. When she asked someone what they were doing there he said that the media had been ignoring both parties so they were cooking up a confrontation. Maybe this is why she came closer to Judaism but did not become fully observant.