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Could you in a sentence or two state what you take "Objectivism" is / means?

Well, they did say “changed”, not “improved”.

The philosophy opposite to the idea that charity is the best way to help out with issues in the world is not objectivism (I assume you mean in Ayn Rand's sense). The political philosophy opposite to EA would be perhaps social democracy, and moreso leftism/left-libertarianism. I think there are some good critiques of efforts such as effective alturism out there - or at least, criticisms which say it doesn't go far enough.