Did you see the video?
Hindu intellectuals interviewed in the video state very clearly that Hindu intellectuals in Kolkata and elsewhere were equally if not more convinced about splitting Bengal into two entities, given the numbers of Muslim leaders and their intellectual leadership in undivided Bengal at that time (led by Sher-e-Bangla and Suhrawardy), which they could not dare challenge at the time. If Bengal remained undivided, Muslims would have become way too powerful in it, leading to the sidelining of Hindu leadership and eventually leading entire WB (including part of Bihar and Jharkhand to have become part of Muslim majority East Pakistan. That was to be avoided at any cost by Hindu leadership.
That is exactly why Congress leaders (including Shyamaprasad Mukherjee of the Hindu Mahasabha/RSS splinter group) wanted the division of Bengal and supported the creation of Pakistan. More so than Sher-e-Bangla Fazlul Huq and Suhrawardy did.
Alongside the division of Bengal, Hindu Mahasabha leaders (Savarkar especially) pushed for splitting Punjab along with Bengal, for similar reasons.
The fact that Jinnah was a deft politician and well-informed negotiator was gravy on the side, and helped the Muslim league's cause for Pakistan. But Jinnah ultimately negotiated badly, most of Muslim majority areas of Assam was given to India.
I don't think you watched the video - give it some due time.
Two nation theory propagated by muslim leaders was the main reason for partition of india , don't try to shift responsibility on others , no hindu leader demanded partition of india .