That's a pretty broad question, so I'll refer you to the Gamer's Nexus video. It's kind of long @ 44 min, so here's a rough summary:

• give employees more time to ensure videos are high quality
• take down inaccurate videos until the issue is resolved
• provide text summaries of highly technical videos, with strikeouts for any corrections so a history of changes is preserved; this helps with referencing them later on platforms like Reddit, Twitch, and Lemmy (i.e. I can quickly quote sections)

And specifically as it relates to Madison's post, make a serious response that addresses each point, ideally pointing to some internal code of conduct and what processes they follow when similar things happen. If there are gaps, highlight those and explain what exactly is going to change, if anything. Just saying the equivalent of "she's full of crap, but we're hiring a third party just in case" isn't the right approach. Even if the case ends up being nonsense, it at least shows a level of transparency to viewers and employees.