I have lived in the Punjab for a total of five years. I was astonished to read what you wrote above. There was absolutely nothing like what you have described. On the contrary, the root of the problem was to try and trump the political domination of the Jat Sikh, working through the SGPC and its political reflection, the Shiromani Akali Dal, by creating a counterweight, a group of an even more assertive nature that outshone the Akali Dal.Punjabis of East Punjab primarily Sikhs and Muslims they are a minority there, the onslaught on their culture, language and religious values was relentless. It was particularly very strong during the indira and following era, sikhs did realize it post golden temple era.
Neither in the Indira Gandhi time nor afterwards did anything like this happen.