Deleuze and Guattari do sometimes refer to freedom and freeing up, but it is a kind of diagrammatic freedom.
A particular activity may be constrained in several ways. The material of its expression may impose a limit, and as Guattari argues in Chaosmosis, a change in the material may act to free it up, to give it a chance of escape. Conversely, material of expression may be constrained to the point of starvation by a language, concept, artistic practice, scientific experiment (all of the aparatus of capture). Loosening the dependence between the material and the aparatus may bring life back to the material. This need to do this may be the source of transcendence. Again Guattari employs this as a psychotherapeautic practice, but guards against transcendence.
Regarding literature (Kafka, Lawrence), they say:
It is always a case of freeing life wherever it is imprisoned. p.171