1) As I expressed, that all the ancient and medieval rulers, who conquered/ruled over large areas, were fundamentally invaders, for a large part of the populace, under their rule. But, unfortunately, this term of "invaders" is only used for Muslim rulers, by elite Hindus; which, in my opinion, is highly prejudiced view. This essentially induces an inescapable religious connotation to this term.
2) A person has obviously multiple associations: nation, ancestry, land, ethnicity/language, religion etc. etc.; but the precedence of these different associations is somewhat subjective, and varies from person to person, sometimes consciously, and sometimes, even, subconsciously. For example, for a person, or a group thereof, if religion is first in precedence, then his/their psychological associations would also be guided and shaped by that. This is natural.
3) According to Pakistan's perception, India is not a secular country, but is under Hindu Raj, since 1947, as it was conceived to be and should be, under the socio-political conditions of this region. That is the foundational basis of Pakistan, as well. Consequently, use of names of Muslim conquerors and rulers, particularly, of this region, for defense equipment, is reactive, in nature.
Having said, all what I have said, I must express, that I fundamentally have no objection on India's use of the image of General Niazi's surrender, wherever they like. That is what enmity entails.