Philosophy: The misplaced concreteness

Hi, I have a technical question in philosophy area.

What is the "exact" meaning of the expression "the misplaced concreteness", that is related with (marxist concepts reification and fetichism:

"To him it was a revolutionary principle of thought, because it broke with the fetishism and reification, with the fallacy of misplaced concreteness, prevalent in the social sciences"

I have translate that how: "la concreción fuera de lugar", but doesn't match with the "fluid text".

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Sé que la expresión proviene de la incapacidad de la ciencia social moderna de evaluar la realidad como un todo. Quisiera saber si en filosofía existe una expresión exacta para tal caso.

Gracias.

I think, in this context, misplaced concreteness refers to the unfortunate or erroneous inflexibility of thoughts and ideas...as if such are set in concrete.

But that's just my opinion.:)

Hello,
This is a bit late, but I've found some explanations in these links:
The Fallacy of Misplaced Concreteness or Reification | Psychology Concepts
https://en.wikipedia.org/wiki/Reification_(fallacy)
You can check the Spanish options and more specialized terms if you change the article language to Spanish.