So I will point out that they asked for a slot when Biden was the nominee privately. That matters. The public request came during the virtual roll call from the article you shared elsewhere. Then they asked for a proper sit down meeting at the event on 8/7.

Move them goalposts.

That was soft committed to, and then that night hecklers screamed at KH, who responded poorly, and RATHER than say “these people don’t speak for us, the VP agreed to a meeting before this happened” they did nothing. THAT is where they become an unreliable negotiating partner.