गोविन्द भाष्य (श्रील बलदेव विद्याभूषण - अचिन्त्यभेदाभेद वेदान्त ब्रह्मसूत्र भाष्य सटीक)

muktaḥ—liberated; pratijñānāt—because of the declaration.
He is liberated because of the statement.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
The liberated soul manifests his original form. Why is that? The sūtra explains,
"pratijñānāt" (because of the statement). The original condition of the soul is
described in Chāndogya Upaniṣad (8.7.1). After that description, the following
promise is given (8.9.3):
etaṁ tv eva te bhūyo 'nuvyākhyāsyāmi
"Again I will explain it to you."
The the demigod Brahmā proceeded to explain that the liberated soul is free
from wakefulness, dreaming, and dreamless sleep, the three conditions of material
consciousness and also free from the material body, which is created by the karmic
reactions of pleasant and unpleasant deeds. The demigod Brahmā described this in
order to fulfill the promise he made in 8.9.3). Because this passage explains that
the soul becomes liberated when he is free from the external material body created
by karmic reactions, it should be understood that in the liberated state the soul is
manifested in its original form.
In this way it is proved that Chāndogya Upaniṣad (8.12.3) explains that in the
liberated state the soul manifests its original form. Now another point will be
considered.
Saṁśaya (doubt): Does the word "jyotiḥ" in Chāndogya Upaniṣad (8.12.3) refer
to the sun-globe or to the Supreme Personality of Godhead?
Pūrvapakṣa (the opponent speaks): It refers to the sun-globe. This must be so
for the Muṇḍaka Upaniṣad declares that after passing through the realm of the sun
one attains liberation. The sun-globe is also described in that way in the
Chāndogya Upaniṣad's description of the path beginning with light.
Siddhānta (conclusion): In the following words the author of the sūtras gives
His conclusion.
Sūtra 3