I replied to that already. Any such vote can be easily overridden by a later one. This is what happened here. Parliament voted to request, or demand, or instruct, government to release this analysis. That overrides anything that came before it. Because that's how Parliament works.
It's interesting to note -- in particular with regards to the case over whether an Act of Parliament was needed to authorise Government to trigger Article 50 -- that many of those who voted to take back control and give it to Parliament seem the least aware of what powers Parliament has, and how it works.
Do keep up, Naomi. :P