On the authors website he suggests:
Full Enlightenment
Unlike partial enlightenment, full enlightenment does not rest on the experience of a deeper spiritual dimension situated beneath your everyday world—spirit, awareness, presence, or what have you. Instead, in the state of full enlightenment, all of experience is a “spiritual dimension,” you might say. This is one reason that full enlightenment is “full” and not “partial.” It doesn’t rest on a mere part or level of existence. Rather, it encompasses the fullness of experience. It comprehensively includes all that you experience—your mind, body, the world, and all things—within itself.
Therefore, even if you don’t recognize it yet, this form of enlightenment includes everything you are experiencing right now—every sight, sound, smell, feeling, thought, and everything else. There is not a single part of you, the world, or anything in the world that is excluded from it. In the state of full enlightenment, enlightenment is inseparable from all experience.
So he seems to be equating ‘enlightenment’ with saṁsāra. Which reminded me of the Nibbāna === saṃsāra? thread, which you might like @Julie_L