Well, I don't know what the author meant by "commemorating 1971 war triumph", if Modi really visits Dhaka during the Victory Day, he would be treated as just another guest head of state, nothing else. AL is surviving on the "Muktijudher Chetona" rhetoric, I don't think they would try to demean the Bangladeshi freedom fighters or martyrs just to appease India. Besides, Hasina would be watchful to the reactions of the Islamic parties before showing any obsequiousness to Modi.
As for India's policy on Bangladesh, if Modi administration really has a prudent mind, they won't try to breach the sovereignty of Bangladesh like the past Congress government did. However, such foreign policies are mainly controlled by the bureaucrats who don't allow significant changes in those policies despite the changes in leaderships. In this case, India's Bangladesh policies are highly influenced by the current Indian ambassador to Dhaka, Pankaj Saran.