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It seems like the situation is exactly the opposite. Heidegger was considered a leading throughout the 20th century and it is only in the last few years that the intensity of his NAZI affiliations has become evident (as well as the degree to which he mix philosophy and politics), leaving his philosophy much more suspect.Nope. His Nazi affiliations were very well known before, during, and after the war, and very widely talked and written about.
He was still one of the most celebrated thinkers in the post-war Europe, including by intellectuals of jewish ethnicity (intellectuals of course tend to know better how to draw a distinction between the person and their work, they're not little children).
And most of those celebrating him, had also touched upon the issue of nazi affiliations, so it's not like they celebrated him hiding those...
The so-called "black notebooks" didn't reveal anything unknown about his collaboration or thoughts, they just got published in much more touchy-feely era, with far less philosophers that had actually lived through those eras alive, and so the scandal was mostly a media one...