There's a difference between colonialism and conquest. Conquest was much much more common in the past than colonialism. Before modern European colonialism, the only people who had made colonial efforts had been the Greeks (with small city colonies in places like Libya, for example), and the Norse, with their colonization of Greenland and their attempt to colonize what is today Newfoundland. Otherwise, the rest was conquest. There's a significant difference between the two.

There are multiple forms of colonialism. The term settler colonialism' is relatively new.

Settler colonialism is a logic and structure of displacement by settlers, using colonial rule, over an environment for replacing it and its indigenous peoples with settlements and the society of the settlers.

Practically every example you will find is Europeans getting on a boat and killing natives. The most famous example is Manifest Destiny also known as America.

You’re making the above poster’s point for them. Well done. It’s pretty fair to assume that Mo Salah’s ancestors were of that same land regardless of what religious or cultural identity they came from.