As an imperfect analogy, assume a true AI. It is dependent on electricity for its continued operation. But a truly free AI still operates it’s will according to its nature. It still self-directs its motion despite its dependence on the external electrical current for its continued activity. The AI’s will is caused, but it directs it is responsible for directing it’s motion, and so can in some sense be called ‘self-moved,’ especially when compared with events in which the causes produce a necessary effect. I don’t necessarily believe an AI such as this could have exist, but perhaps it helps to illustrate the point.