Yep, people surviving gulags (where btw. lot of jewish people died as well), need to be called names, because they them selves were not saints and said stupid things sometimes.
All humans are fallible. There have been some regrettable Nobel Peace Prizes out there, and Amnesty International had to call off some of their awards.
Why? Just because an author disappoints you, doesn't mean you need to try to undo your enjoyment of a book they wrote.
The fact is that his accounts are not factual, but designed to stoke emotions. That is the definition of propaganda, even though people may not like that word. Plus, his personal feelings about matters such as anti-semitism, Russian exceptionalism, and dictators such as Putin, have to be taken into account when reading his texts about such matters.