It works a little differently from that. These systems measure influence, impressions and traffic don't mean much.If this is the case you'd think Marchi, Rial, and Sabat are already fucked by the system. I wish they were. Or that shitposting "Chris Sabat is a Nazi pedo white slaver cannibal who eats babies" everywhere would actually be enough to destroy his career.
Statements like the one above would not be effective in tying him to the subject. There would need to be a batch of 30 - 40 "reasonable sounding" cannibalism articles quoting Chris Sabat as a source. They would need to be released over a few months, linked to multiple times from different people on social media sites, and shared periodically on other platforms using URLs that include the link from Facebook. It goes nuclear when people start calling into radio shows in England and Venezuela complaining about cannibalism form this monster Chris Sabat who works for Funimation. Bonus points if the person speaks clearly so that TV Eyes can pick it up.
MeltWater has a Content Marketing guide explaining the basics. Veritone works basically the same way, but they put greater emphasis on the length of conversation, the number of people involved, the frequency of posts including the keywords, that sort of stuff. The normal rules of SEO apply, don't post the identical article to 100 places, spin it and post similar ones. They don't need to be grammatically accurate, they need to have the name and be shared.
I don't suggest a group of people get together to do this, in a roundabout way it's the equivalent of what they did to Vic and it's wrong. But it does get into this interesting area of how you can influence the reputation of a celebrity. These systems assume there would be some kind of push-back if the celebrity was actually popular, the numbers are very cruel to those with no one to fight for them. Influence can be measured even in private groups on Facebook, anything that gets shared is available to their APIs. You could run whisper campaigns where the target has no clue what's happening.