I wonder what did really happen?

https:// wikileaks.org/gifiles/docs/33/337350_-os-vatican-catholicism-pope-changes-rules-for-electing.html

No such extremes were needed in 2005, when then Cardinal Joseph Ratzinger was elected on just the second day of the conclave.

He had at least a two-thirds majority, but what happened behind closed doors in the frescoed Sistine Chapel in April 2005 is secret. The 115

cardinals who entered the conclave took a vow of "absolute and perpetual secrecy" not to reveal details about the election.

But one account published in respected Italian magazine Limes in 2005 said Ratzinger was elected Pope only after his closest rival in the conclave,Cardinal Jorge Mario Bergoglio from Argentina, indicated he did not want the responsibility.