No! It instead is pretty weak. They have NO case whatsoever.
If UN has to implement its decision, then as per the Resolutions, ALL Pakistani forces including tribesman it has used for fighting in Kashmir in 1947 have to withdraw first, which Pakistan has not done till date. So that is a non starter.
If the UN has to implement its decision, then there is NO third option of independence. It's either India or Pakistan. So either way, independence to Kashmir is out of the question.
On what grounds should there be a referendum in Kashmir? Scotland's case is totally different.
If independence is an option, then why not a referendum in Balochistan, Sind, Waziristan, etc for independence?
I repeat, THERE IS NO THIRD OPTION OF INDEPENDENCE IN THE UN RESOLUTIONS. Period!
So why is Pakistan continually harping on the UN Resolutions?
The Simla Agreement has overtaken the UN Resolutions.
Lastly, the UN Resolutions which were passed under Chapter VI of UN charter are considered non binding and have no mandatory enforceability.