tadapi bahir-aṅgaṁ nirbījasya
Even these last three limbs are external when compared to a “seedless” state.
No matter how subtle or internal they might be, the three limbs three [dharana, dhyana, and samadhi] that constitute saṁyama are gross or external as compared to the true experience of nirbījasya samadhi.
Thus, the above describes “levels” through which you must progress, each in turn, at your own pace.
Damian Cadman-Jones is an authorised teacher of Prana Vashya Yoga™