Earlier quoted context omitted.
It would probably be illegal to market a product that wasn't butter as "Clean Butter", because there are rules about labeling things as butter. So I won't be surprised if the animal products industry lobbies for rules about what can be called meat (or if such rules already exist). Of course such labeling concerns don't apply to an internet discussion, but they do indicate that people care about what's in a name.
Usually, though, lab-grown meat is actually meat. It's possible that it'd have to be labeled "synthetic" or "lab-grown" (similar to how synthetic diamonds are named), but claiming that meat is not meat is nonsensical.
A typical simple one is "animal flesh". Cells grown in a vat aren't flesh, they are a tissue culture.
Note that I'm not particularly animated by the issue, I just don't agree that it is as simple as "claiming that meat is not meat".