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This is the point of the Leninist party politics. It is the activist embodiment of Marxism. The Frankfurt School was trying to understand why the revolution had only occurred in Russia despite the predictions of Marx's theory. Their reasoning was post-hoc rather than strictly causal but it is the reason given to account for the failure of the proletarian class to rise up in class consciousness and the justification for a vanguard to lead the way. It remains Leninist despite the involvement of the Frankfurt School. In fact, it really proves the point. The training is literally training in revolutionary tactics. Peter Singer qua philosopher us not an activist, but of course there are trained activists in the animal rights movement who are trained in tactics to promote an agenda rooted in utilitarian reasoning. Sorry for the snark but you seem to be engaging in a bit of casuistry or being willfully obtuse about the ordinary meanings of activist and training.