Even if you give India evidence they will never admit they are involved in terrorist activities..
This news is largely for internal consumption. Much of the world knows that. That's why you don't see any real statements of substance from India, or other Pakistani partners for that matter. No one is asking for proof, or verifying it independently.
The Pakistani state is turning against actors it used to enable 'strategic depth' in Afghanistan. Spurred on by the Urdu language dailies, there is quite a bit of support for the jihadis in this region. The red meat that's being thrown, that India has nefarious designs for Pakistan and is supporting jihadis, is to solidify support.
I agree with the Indian analysts that say Pakistan needs to do and say whatever it wants to combat the forces it's fighting now. If that means little news blurbs about India supporting jihadis, so be it. Pakistan is in a precarious situation.