My intention wasn't to underestimate the book, I've gone through it (not as thoroughly as I should've) and it is a very comprehensive and well written piece of theory. As you mentioned, translation artifacts and selecting certain terms over others is always going to lead to the text changing, to the point that many people usually recommend to read one translation over another because they're not seen as interchangeable, even if the original text is always the same. I just went over the digital copy of the book and the translation notes and footnotes are everywhere, which shows real work and care was put into translating the text.

That being said, OP's question felt more like something that should be addressed by a more specific text, one that concerns itself with explaining at length what the concept of consciousness is within a Marxist phenomenology, why it is so and what are the implications of this in the context of diamat or revolutionary politics. This by itself could be one or a series of books.

It's not that the textbook isn't good or complete, it's that it doesn't concern itself with defining every single philosophical term in it because it's not its purpose