I don't agree with your version of the events here. The denial related to Biden's official meeting schedule. When asked about the unofficial schedule, his rep provided no comment. Also, this was narrowly addressing the Burisma executive meeting him directly while in the VP seat.

My point is relating to the complete anthology of content that has been leaked in the form of text messages, voice recordings, and emails that have been confirmed by the conversation participants (Frank Luntz among them). Why can't the NYT or any other mainstream news organization put questions to Biden on that?