See there are no such instructions available regarding the domicile certificate. Although If possible I would recommend you to update it then you will have no problem to face. If its required or not you are on the safe side. As per the notification there are no such dates mentioned, so you have nothing to worry about if you don't update it.

To know more about college predictor visit the link below:

https://medicine.careers360.com/neet-college-predictor

To know more about the Domicile Criteria visit the link below:

https://medicine.careers360.com/articles/neet-domicile-criteria

I hope this answer helps. All the very best for your future endeavors!