abhāvānām abhāvarūpatyāgād ity arthaḥ / etad uktaṃ bhavati yadyapohānām apohyatvaṃ bhavet, tadaiṣāmabhāvarūpatvaṃ pratiṣiddhaṃ bhavet, tat pratiṣedhe ca bhavatyabhāvairabhāvarūpatvaṃ tyaktaṃ syāt /
This means: because negations would abandon their negative nature. The explanation is as follows: if exclusions were subject to exclusion, then their negative nature would be negated, and with this negation, the negations would abandon their negative nature.