Another claim is that gold ORMUS was the manna, the “bread from heaven” spoken of in the Bible, which they say was created by Moses grinding up the golden calf and making his followers drink it. Is any of this true?

While that biblical story is true in describing action taken by Moses to create a kind of consequence, an object lesson, for his followers who had strayed and needed to be reined in, as described in the biblical account of his leadership, that is not what constituted the manna allowing survival of those in the desert for 40 years without a normal source of food. That was provided by the divine realm to those individuals by bringing the supplies into being physically, as needed, through manipulation energetically, courtesy of divine consciousness.