Deborah Lipstadt summarizing a piece by Professor Martin Marty of University of Chicago:

Professor Marty’s conjecture reaffirms my view, i.e. that the Pope did not not care [that’s not a typo] about the fact that the Society has some weird views. He may have specifically known about Williamson’s denial [probably did].

lipstadt.blogspot.com

Marty’s piece can be read here:

Pope Benedict and the Jews
divinity.uchicago.edu