They want the Trump Jr. and Chamath connections to be forgotten by the time the media and YouTubers get active again after New Year. It's a standard media tactic.

What's your angle on the Chamath link? Is Nvidia greasing Sack's favour through Chamath?

Honestly, it's basically an accepted fact that the best thing to do is just to never respond anything that media/people say. If you respond, the conversation will continue. If you just say nothing, they'll move on to the next topic, because everyone needs to keep their audience engaged. With no response, your audience isn't interested either, so you have to move onto something else.