Then the path of the void becomes the royal road of prāṇa; then the mind becomes supportless; then death is cheated.

Śūnya-padavī — the path of the void — is Suṣumnā, the normally inactive central channel. When Kuṇḍalinī awakens, Suṣumnā becomes rāja-patha, the royal road through which prāṇa ascends.

Cittaṃ nirālambam — the mind without support. Normally the mind rests on objects, thoughts, sensations. When prāṇa enters Suṣumnā, the mind loses its habitual foundation and becomes suspended, entering states of deep absorption.

Kālasya vañcanam — cheating death. This is one of the central aims of Haṭha Yoga: transcending the limitations of time. It is not about literal physical immortality, but liberation from the cycle of birth and death through realization of the Self.