Here's the thing. You said "vote manipulation is cheating the site."
Is it in the same family? Yes. No one's arguing that.
As someone who is a scientist who studies web forums, I am telling you, specifically, in science, no one calls multi-voting cheating. If you want to be "specific" like you said, then you shouldn't either. They're not the same thing.
If you're saying "vote manipulation family" you're referring to the taxonomic grouping of votidae, which includes things from posting quality original content to asking strangers for votes to running vote-bots through proxies. So your reasoning for calling multi-voting cheating is because random people "call the unusual votes cheating?" Let's get copypasta and image macros in there, then, too. Also, calling someone a human or an ape? It's not one or the other, that's not how taxonomy works. They're both. A bot-vote is a bot-vote and a type of vote manipulation. But that's not what you said. You said vote manipulation is cheating, which is not true unless you're okay with calling all members of the vote manipulation family cheating, which means you'd call good posting, bad posting, and copypasta cheating, too. Which you said you don't. It's okay to just admit you're wrong, you know?