I found this additional clarification in The Treasury of Knowledg – Book Five -Buddhist Ethics by Jamgon Kongtrul
The four exceptional pledges of Atiyoga relate to non-existence,
naturalness, spontaneous accomplishment, and oneness.
There are two pledges associated with cutting through (Tib. khregs chod), relating to the essence of primordial purity (Tib. ka dag),
Non-existence
The pledge to liberate oneself from grasping to the reality of ongoing phenomena by realizing that, as illustrated by the eight similes of illusion, everything that manifests as the environment and inhabitants is primordially non-existent;
Naturalness
The pledge to liberate projected appearances in the state of reality by cultivating unsupported, utterly natural intrinsic awareness not entangled in the tension of grasping at an observer.
There are two pledges associated with direct leap (Tib. thod rgal),
Spontaneous Accomplishment
The pledge related to the natural expression of spontaneous accomplishment (Tib. lhun grub), to disengage oneself from an outer spiritual quest, confident in the realization that buddhahood is to be actualized within oneself through continuous experiential cultivation of the four visionary appearances of spontaneous perfection, which are the manifestation of the radiance of the five lights;
Oneness
The pledge to arrive in the kingdom of the primordial exhaustion of phenomena through the confident realization that all occurrences and manifestations of thoughts, events, feelings, circumstances, and ongoing appearances are solely natural pristine awareness.