If libertarian free will does not require the absence of all sufficient causal conditions but only the absence of compulsive or determining external causes, conjunct (2) is either false or redundant.

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Compulsive causes(as a type of external influence being discussed): Forces or pressures that force you to act against your will, leaving you no real choice in the matter.
Conjunct (2)(as a reference to a particular statement being evaluated): A specific part or claim (labeled as number 2) in a larger logical argument that is joined together with other parts.
Determining external causes(as what libertarian free will supposedly requires the absence of): Outside influences (from the environment, other people, etc.) that completely control what you do, removing your ability to choose differently.
Sufficient causal conditions(as a philosophical requirement): Circumstances or events that are enough by themselves to guarantee that something else will happen; if the conditions are met, the result must follow.

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