Some people have asserted as much, including people who have known him personally. Others have said that those assertions are false.
Since I don't have evidence either way, it "might" be true. Might. Might! I'm not saying it's true. I'm saying I can't prove it's not true.
I'm also saying, if that upsets you, think about why that might be. Is it because you know Mr. Assange personally and know it to be a false allegation? Or is it because you like Wikileaks and interpret any attack on Assange as an attack on Wikileaks?
"L'etat, c'est moi"? I don't believe that's true. I think we should be wary of cults of personality. Even if we don't think the "personality" is themselves creating it.