In my opinion, that's just a defeatist view because it means poor people in underdeveloped countries will remain poor unless we somehow manage to entirely undo 500 years of colonial history.
Rather than dwell on the past, we should try and find ways to create a better future. Mind you, this doesn't mean forgetting about the past and the atrocities committed under colonialism or revising history accordingly, but rather have that past inform our actions today.