Cypress oil is distilled from the needles and twigs of the Mediterranean cypress, and its defining property is that it is a vasoconstrictor — it tightens blood vessels. That is the opposite of what ginger or rosemary do, and it is useful for a different problem.
Where blood or fluid is pooling and sitting — heavy legs at the end of the day, puffy ankles, the aching congestion that comes with poor venous return — cypress helps move it along. The book lists it for cold feet, where the benefit is improved circulation overall rather than direct warming.
It is also a strong astringent and deodoriser, so it does double duty on sweaty feet.
