tadasamyak na hyubhayākāravinirmuktaṃ vastu svalakṣaṇaṃ yuktam nityānityayor anyonyavṛttiparihārasthitalakṣaṇatvāt
This is incorrect, for no entity possessing a specific characteristic can be devoid of both these forms [i.e. eternal and non-eternal], since eternality and non-eternality have the characteristic of being mutually exclusive.