No, the people of Gilgit-Baltistan had risen up against Maharaja Hari Singh's Dogra forces in the region, and then officially ceded themselves to Pakistan.

Besides, not like India has any legal right to Kashmir.

Even the dubious claim they did have they've gotten rid of in 2019 by violating the very condition that the state had joined India because of by getting rid of the semi-autonomy of the state.