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

Personality of Godhead was also created at some point. This may be so because the
Supreme Personality of Godhead is not really different from these other causes.
In the following words the author of the sūtras addresses this doubt.
Sūtra 8
asambhavas tu sato 'nupapatteḥ
asambhavaḥ—the state of not being created; tu—indeed; sataḥ—of the eternal
Supreme Personality of Godhead; anupapatteḥ—because of impossibility
Indeed, the eternal Supreme Personality of Godhead was never created, for such
a creation is impossible.
Purport by Śrīla Baladeva Vidyābhūṣaṇa
The word "tu" (indeed) is used here either to remove doubt or affirm the truth
of this statement. The eternal Supreme Personality of Godhead was never created.
Why not? The sūtra explains: "anupapatteḥ" (because that is impossible). There is
no creator of the Supreme Personality of Godhead, because it is illogical and
inappropriate to assume the existence of such a creator. That is the meaning here.
Śvetāśvatara Upaniṣad (6.9) explains:
sa kāraṇaṁ kāraṇādhipādhipo
na cāsya kaścij janitā na cādhipaḥ
"the Supreme Personality of Godhead is the cause of all causes. He is the king
of all other causes. No one is His creator. No one is His king."
It is not possible to say that because all other causes are created by something
else therefore the Supreme Personality of Godhead must have been created by
someone else, for such a statement contradicts these words of the Śruti-śāstra. A
root cause of everything must be accepted, for if it is not then there is an unending
chain of causes. By definition the root cause of everything does not have another
cause, a root from which it has sprung. This is described in the Saṅkhya-sūtra
(1.67) in these words:
mūle mūlābhāvāt