You are asking about other Beings who are not residing on Earth i.e. Aliens. What is their concept of God? What is their concept of Enlightenment?
It’s all to do with Dimensions. Any species that would visit Earth, for instance, would come from other (Higher) Dimensions – much more elevated than Planet Earth.
It’s only third dimensional beings that look for the Oneness that is missing – they are only able to ‘see’ separation. All other Dimensions beyond 3, house Beings who are Totally at One – so no need to have that concept.
People on Earth used to be like that, but they have lost that Awareness – it will come again!