They are not to be foisted on one's readers as anything "ex cathedra."
Why does he pronounce, ex cathedra and robed, that Cowper is no poet?
For your ex cathedra knowledge of serving wines, for example.
Their opinions are given with an ex cathedra air that seems to exclude any appeal against them.
Whatever is may not be right—the maxim has too much of an ex cathedra sound—but ...