The translators perhaps understood “insight into knowledge of liberation.”

Both knowing and directly accessing liberated knowing; the fifth of the five undefiled aggregates that are characteristic of noble ones.

Both fully knowing and directly accessing the knowledge of liberation; the fifth of five qualities of the Saṅgha (the others being discipline, samādhi, wisdom, and liberation) that are also described in other texts as the five undefiled (or beyond-worldly) aggregates (skandha) characteristic of noble ones.