Ah yes, transitive veganism

I'm pretty certain my local NextDoor would express absolute anger and disgust at this very real advertisement. Boycott Crompton Farms, they'll demand.

It would not be vegetarian. Vegetarianism isn't inherently an ethical stance; it's a "no eating meat" stance. People can do it for health reasons, religious ones, environmental ones, and ethical ones (the latter is not internally consistent, but it is something people do specifically because it feels more ethical). But the reason for doing it doesn't change the underlying bedrock of "no meat".

Would it be vegan? I'm going to guess that while most vegans would consider it "less bad", they'd still point to the gargantuan amount of animal testing, murder, and tissue harvesting that goes into researching and producing lab-grown meat. Even the Impossible Burger is considered nonvegan and just "plant-based" by a substantial portion of vegans who know about how Impossible decided to perform animal testing even when it wasn't strictly necessary legally and made no fucking sense logically. The R&D alone for lab-grown meat is orders of magnitude beyond that.

We don't know... It just is!!!

because the literal opposite happens with people making chicken fingers that contain no chicken and other crap like that.

To me it's funny because of the ridiculousness of the cultural pride in beef consumption