The rules as written do not prevent Spanish Guerrillas from moving outside of Spain. Is that intended?
No, 15.54.2 reads "They are only in play if a Liberation War begins in Spain, see 15.44". The intent (unless I am completely mistaken) is that they are only in play DURING a Liberation War and removed when it ends. And during a liberation war no Spanish units can move outside Spanish territory (184.108.40.206).