No. What we are saying is that murder is a universal taboo. That the "arbitrary rules" of every social group on earth regulate killing demonstrates exactly that. It is precisely these rules that demonstrate universality. Some societies regulate what you can eat - halal/kosher. Most don't. Thus, there is no universal taboo against "unlawful eating".
I struggle to think of a society that didn't have some regulation on what you can eat. They almost all have taboos against various meats especially. Can you give me some examples?
> Thus, there is no universal taboo against "unlawful eating".
That's probably a poor choice of example given cannabilism is pretty uniformly condemned.
Even ignoring that, pretty much every society regulates food. The health inspector shutting down resturants is just as much of a regulation as religious rules like kosher & halal (and there is some reason to suspect that the original goal of those rules were at least partially health related and made a lot more practical sense with the technology available 2000 years ago)
Nonetheless, ignoring all that, i still think any self-referential taboo applies in all circumstances, and thus is kind of pointless to discuss.
E.g.
All societies regulate unlawful insider trading. Societies where all insider trading is lawful are still vaccously regulating unlawful insider trading.