This article has more details. https://edition.cnn.com/2021/08/12/tech/twitter-india-congre... The opposition party clearly had the permission of the parents to post the photo. The Indian government appears to have requested of Twitter to remove the photo since it was used for political purposes by the opposition.
It's clear from context because the photos are from a meeting with the victim's family. You can see the censored photos here: https://timesofindia.indiatimes.com/city/delhi/rahul-gandhi-... I don't know why India has a law against showing photos of rape victims families. Perhaps because rape brings shame to the victim's family in some circles. However, if you are publicly meeting with a national politician you clearly do not ascribe to that view and it is obvious that you wouldn't mind being seen in photos with that politician.
Where does it say in the article you have linked?