I browsed a number of definitions of "colony" and none seem to include displaced indigenous people.

Some definitions seem to focus on the emigrants (and descendents), and some definitions are more about the region being colonized. But the displaced (or killed) people are neither.

The comment to which I replied was talking about weapon superiority. If by "deprivations of colonialism" it meant the indigenous people being deprived, then it would make a lot more sense to say "deprivations of invasion". But that's not saying much: that better weapons are more effective at invasion.

This definition of "colony" refers exclusively to the colonizers, not the colonized. At this point you're just saying that colonialism sometimes works out very well for the colonizers, which is no longer a counterpoint to what you're responding to.