This may or may not be true - I would not dismiss such a possibility since I'm in no position to verify. And Pakistani leadership has, of late, been making overtures to Russia so it's possible.
But these arrangements are, IMO, easy to get into but hard to get out of - and the benefits they offer are debatable. As I recall Pakistan had similar arrangements with the US during the Cold War but that was not helpful as expected during conflict. India, on the other hand, never allowed the USSR similar facilities despite seeking their diplomatic and political support in that same era.
Allowing the use of ports, bases, etc. to military forces of other countries (especially in peacetime) is a small compromise on sovereignty and in the long term can create resentment, misunderstandings and contempt between parties. It's not just Pakistan - I would say the same in case India allowed something similar to the US (which thankfully it has not as yet)
In short: a bad long term move.
