Beginning is not longer real life, but commodity as a historical form, and then penetrate from surface. The focus of Marx in Capital, is not ideology versus reality, it is commodity fetishism found at the very heart of reality.
Marx never calls commodity fetishism ideology. Rehabilitate this post-Marxist Marx (which is close to Albritton/Sekine)
What to do with labour theory of value. Marx commits the same error of abstraction. Abstract from concrete commodities, being products of human labour. Z if you abstract from concrete use value what you get is abstract property of being useful. But why is Marx here right.
Postone gave great explanation: Concrete labour and Abstract labour (source of value) it is not question of abstraction. The uniqueness of capitalism, we get personal freedom because the fundamental relations of exploitation are inscribed in process of capitalism itself.
Absract labour means as Postone put it, in other pre-capitalist relations domination was enacted in personal relations outside of production relations, exploitation was assured through extra-economic means. Whereas in capitalism, we can see labour as the sole source of value. It isn’t some wierd ontology, IT CONCERNS LABOUR AS A SOCIAL PHENOMENON.