I read the comment and my enabledRule is now triggered/invoked once I call refreshState for action in SelectionEvent of table.
@Subscribe("patientFormsTable")
public void onPatientFormsTableSelection(Table.SelectionEvent<PatientForm> event) {
reviewPopupButton.getAction("reviewPrint").refreshState(); // Need to call method refreshState() so that "enabledRule" for Action is triggered
}