I'm using the usual translation....and as usual, I'm not authorized to say a word by a teacher; my words and comments are purely mine.
This chapter can pretty much be summarized as:
All ... views of Nirvana severally advanced by the philosophers with their reasonings are not in accord with logic, nor are they acceptable to the wise. Mahamati, they all conceive Nirvana dualistically and in a causal connection. By these discriminations, Mahamati, all philosophers imagine Nirvana, but there is nothing rising, nothing disappearing here, -[and there is no room for discrimination.] Mahamati, each philosopher relying on his own text-book from which he draws his understanding and intelligence, examines [the subject] and sins against [the truth], because [the truth] is not such as is imagined by him; [his reasoning] ends in setting the mind to wandering about and becoming confused, as Nirvana is not to be found anywhere.
... Mahamati, there are others who, roaring with their all-knowledge as a lion roars, explain Nirvana in the following wise: that is, Nirvana is where it is recognised that there is nothing but what is seen of the Mind itself; where there is no attachment to external objects, existent or nonexistent; where, getting rid of the four propositions [oneness and otherness, bothness and not-bothness, being and non-being, eternity and non-eternity], there is an insight into the abode of reality as it is; where, recognising the nature of the Self-mind, one does not cherish the dualism of discrimination; where grasped and grasping are no more obtainable; where all logical measures are not seized upon as it is realised that they never assert themselves; where the idea of truth is not adhered to but treated with indifference because of its causing a bewilderment; where, by the attainment of the exalted Dharma which lies within the inmost recesses of one's being, the two forms of egolessness are recognised, the two forms of passions subsided, and the two kinds of hindrance cleared away; where the stages of Bodhisattvahood are passed one after another until the stage of Tathagatahood is attained, in which all the Samadhis beginning with the Mayopama (Maya-like) are realised, and the Citta, Manas, and Manovijnana are put away...
So Nirvana, in the Lankavatara, is intimately bound up in the awareness of non-discrimination