When a cause of action on appeal from a trial court's order sustaining demurrer is not discussed in the brief, is it abandonment of that cause?

Health (2008) 160 Cal.App.4th 981, 984, fn. 1 ["failure to discuss cause of action on appeal from trial court's order sustaining demurrer constitutes abandonment of that cause of action on appeal"]; Ellenberger v. Espinosa (1994) 30 Cal.App.4th 943, 948 ["When a brief fails to contain a legal argument with citation of authorities on the points made, we may 'treat any claimed error in the decision of the court sustaining the demurrer as waived or abandoned,' " thus "our review is limited to only those causes of action briefed on appeal."].)