No one reported you claimed those things and particularly not in an official meeting where there should have been minutes and would have been witnesses which could have boosted a lack of recollection to certainty.
Your examples also fail to continue with "but if I did it was a joke" -- a remark itself almost as damning as the act. We're not talking about mere defamation in the case of Assange: talking about the secretary of state-- who unambiguously has the power to murder foreign persons with a suggestion-- suggesting that she's would joke about murdering people. Not a great look.
So, no, your remarks are unambiguously not denials, but no denial was required in your case.
