У йогачаров косяк с этой нисвабхавой

Анабхогин


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in the Animitta Samādhi Sutta (S 43.4), the signless concentration (animitta samādhi) is called “the path leading to the unconditioned” (asaṅkhatagāmi magga), that is, the way to nirvana

The term, “signless concentration of mind” (animitta cetosamādhi) is not fully explained in the Nikāyas, “but its placement after the eighth formless attainment [of S 40.9] suggests it is a samādhi qualitatively different from those attained in samatha meditation.” (S:B 1140 n180). The term, however, occurs in the explanation of the “signless liberation of mind” (animitta cetovimutti) in the Godatta Sutta (S 41.7), thus:
And what, bhante, is the signless liberation of mind?
Here, with non-attention to all signs, a monk enters and dwells in the signless concentration of mind.
This is called the signless liberation of mind. (S 41.7/4:297,3-6)

the Poṭṭhapāda Sutta (D 9.17) passage on the attainment of cessation, which runs thus:
So, Poṭṭhapāda, from the time that the monk is one who masters his own consciousness here
(the 1st dhyana), he goes from one state to another in stages until he reaches the peak of consciousness.

(“Peak of consciousness,” sannaggam, here refers to the sphere of nothingness (akincannayatana) (DA 2:373). Whichever mental state or dhyanas that one turns towards spiritual liberation, that state is called saññagga)

And when he is established at the peak of consciousness, it occurs to him: “Mental activity is bad for me. It would better for me not to be thinking. Were I to go on thinking and planning, these states of consciousness I have reached, would pass away, and other coarser ones, might arise. So let me neither think nor plan any more.” And so he neither thinks nor plans. And to him, neither thinking nor planning, the states of consciousness he has passes away, and no other gross consciousnesses arise (in him). So he attains cessation. (D 9.17/1:184) = SD 7.1

nibbānam pi animittam eva (MA 2:335)

Нирвана - это анимитта.
the signless (animitta) is nirvana


Of the 4 liberations of mind—the immeasurable, through nothingness, through emptiness, and the signless — as mentioned in §30 [Mahāvedalla] Sutta, only the signless liberation of mind is supramundane. The first three — the divine abodes (brahma,vihāra), the third formless attainment, and insight into the emptiness of formations — all pertain to the mundane level (M:ÑB 1240 n451).

(A) attending to neither the perceptions of the third formless sphere nor the fourth formless sphere, attends to the oneness dependent on the signless concentration of mind. His mind then enters that signless concentration of mind and is focussed. He understands that since the state is conditioned and volitionally constructed, it is as such impermanent and
subject to ceasing.
(B) Immediately after that comes the passage on the attainment of arhathood, thus:

(A) Furthermore, Ānanda, a monk, attending to neither the perception of the sphere of nothingness nor the perception of the base of neither-perception-nor-non-perception, attends to the oneness dependent on the signless concentration of mind.
His mind plunges into that signless concentration of mind,13 brightens with faith, becomes
steady, and is resolute.
He understands thus: “This signless concentration of mind is conditioned and volitionally produced. And whatever is conditioned and volitionally produced is impermanent, subject to ending.”

Кстати, почему вы данное бессознательное состояние дхьяной называете? Основа любой дхьяны — виджнана, которая в этом состоянии растворена.

Полностью виджняна растворена уже при входе в 4-ю.
Есть такой левел - asamjnasattva...

виджняна - до 8-й дхьяны растворена не полностью, "остатки" есть даже в 8-й.

Думая на этом можно закончить нашу беседу.

Си-ва-кон, архат - уже освобожденный, ему не надо ничего достигать для освобождения. Испытывают нечто только потому, что хотят. А плод этой "9-й дхьяны" для анагамина - вообще рождение в бхавагре. Ваша изначальная ошибка - что вы последовательность дхьян посчитали ступенями освобождения. И высшую из них, соответственно, приняли за высшее в освобождении.