Pakistan developing a nuke sub will not go well with US. Right now, US knows that no Pak missile can reach the US mainland. They at most threaten US interests in the middle east, namely Israel.
With a nuke sub, the game changes, not only does PAK have nukes but now they will possess a capability to deliver it to far off locations. This would pose a direct threat to not only US, but a lot of other western nations.
Given how badly Pak depends on US aid, any such expenditure will be met with push back from the US. So i would say that developing a nuke sub is a pipe dream unless China steps in and lends one to Pakistan.
As a side note, the authors overtones of "Hindutva" and "Indian domination" is the same crap which the army has fed Pakistan for 60 years. Creating the bogey man so that they can rape and pillage the Pakistan economy. The current doldrums the Pakistan economy faces is because of this hate campaign.
This is not a 1500s, today economy is the **real** power, not nukes and not standing armies. NK seems to have both of them still neither do they have world respect or clout.
We can go on and on about Hindu-Muslim, mughal rule, muslim dominance and other historical BS, but the sad truth is that the world has changed. Today no one cares about your supposedly superior genes (Infact, you are looked down upon if you mention this in a civil setting), all people do care about is what you bring to the table in the global arena.
So can someone tell me, what Pakistan brings to the Global area to garner respect?