Someone taking down Indian flag at any place isn’t going to impact Indian sovereignty. It isn’t so weak that one flag would undermine it, or affect it in anyway.
Summoning of UK diplomat is the usual step in such incidents.
Those dreaming of revival of Khalistan movement would be disappointed since India has decided to crackdown on crackpots who were trying to revive it. Amritpal is on his last leg and might be found dead very soon.
Only value of such events is, Windbreaker having an ecstatic moment and creating a thread.