It wasn't so much simply "opinion" as it was the result of his extensive research on the subject and of communist writings. You make a valid point that the list shouldn't be considered as authored by a communist, but at the same time it's not fair to categorize it as just guesswork on his part either.
Qwinn
True, but people were acting as if this list were written by Stalin. I just wanted to make sure people understood what it was.