A blanket ban for mentioning religious holidays outside of christian holidays would fit to bavaria and would even be defendable there (there is the famous case of the crucifix being allowed in school rooms there, but no other religious symbols). It would be seen as a way to limit the attack surface when mentioning one holiday but not the other, apart from the ones which are state-wide. But that's an explainable policy then. It's the firings of the managers that don't match with that, plus the silence.