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By "these tools" I meant diamat and histmat which Marx introduced basically because he wanted to obtain specific conclusions that "bourgeois science" wasn't able to deliver.
The statement about inability to objectively describe reality referred to 20th century postmodernists, I similarity in motives and mpde of operation of both Marx and postmodernists.
Now we got climate deniers, anti-GMO and anti-vaxxers who resort to the same techniques for the same reasons.