asy: The first citation was by the chief zionist rabbi appointed by the state government where even the non-Jewish and religious-hating members of the Kenesset get to vote on who is their state’s chief rabbi. The second citation was from an unknown source with an unidentified author.
The same reasons the rabbonim oppose Yom Hashoah applies to Yom Hazikoron. In fact the reasons the rabbonim oppose Yom Hatzmaut also applies to Yom Hazikoron, as Yom Hazikoron was originally the same date as Yom Hatzmaut but was specifically moved to one day earlier by the rasha Ben-Gurion to keep Yom Hazikoron directly associated with Yom Hatzmaut.