If I understand correctly, the problem hasn't been the organisational team, but David Tolnay himself. Who intervened with the help of Josh(?). In his own words:
Josh was aware of this from his role as not only language co-lead, but also member of the RustConf program committee1.
I expressed forceful skepticism that the compile-time introspection work, which I had been passively following with great interest, would achieve a state that would be suitable for a RustConf keynote in time for 2023 RustConf, for lack of adequate lang team iteration (neither for the Rust Foundation grant selection, nor conference presentation) to land well with the RustConf audience.
From https://gist.github.com/dtolnay/7f5da4bf057b7c6d0d00c6bed306...