This is nonsense. Pakistan was invented out of the fictional Two Nation Theory, and included present-day Bangladesh at the time. 'Indus Valley Civilization' is an etymological construct. Pakistan has to deal with territorial nationalism and the Two Nation Theory at the same time.
For over 8,000 of the last 9,000 years, the land that is now Pakistan existed as a distinct political, social & cultural entity not ruled as a whole except for roughly a century each under the Mauryans & UK
In 1947, it wasn’t just created it was reborn as a civilisational state