yadyapramāṇasādharmyamātreṇāpramāṇaṃ syāt tadā sarvatra pramāṇānām aprāmāṇyaprasaṅgaḥ śakyate hi sarvatra vastutvādinā sādharmyaṃ vaktum iti saṅkṣepārthaḥ /
If something were invalid merely due to similarity with an invalid means of cognition, then invalidity would follow for all means of valid cognition, since some similarity like "being an entity" can be stated in all cases - this is the meaning in brief.