The Implausibility of Brecht

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In describing ‘The Street Scene’ (Brecht on Theatre: The Development of an Aesthetic), the author suggests that “It is most important that one of the main features of the ordinary theatre should be excluded…the engendering of illusion”. Further on in the text, he suggests that “the demonstrator should derive his characters entirely from their actions. He imitates their actions and so allows conclusions to be drawn about them”. Is this detachment possible? Can an imitation or story be told in a way that is devoid of illusion? Is Brecht stating that this is a goal for actors to aim for whilst being cognizant of the fact that it is implausible? Is it the examination of this implausibility what Brecht is challenging actors to confront?