I believe what you're saying is true, too.
Here's an article that explains how they proved that he couldn't have done it, but was convicted anyway.
He was finding a lot of dirt on the Vatican's finances, and I believe he was set up. I've been reading about attacks on him since the late 1990s. They've always hated him in Australia because he was such a conservative. Think of him as the Donald Trump of Australia: the press always attacking him, liberals always accusing him of terrible things, and he was always able to flat out prove he was innocent.
Thanks for that link. I think that the full story is not known.