They’re Not Wrong
To be fair, this sign is not totally incorrect. Even though eggs are sold in the dairy aisle of supermarkets, they’re just unfertilized chickens. So when you’re eating eggs, you’re really eating poultry. But this is never how one would actually promote boiled eggs. It has to be a joke.
The sign is attached to the bowl of boiled eggs, so it’s pretty clear it’s promoting the low price of them. But many customers at this buffet will still be puzzled by the fact that the sign reads “boneless chicken”. However, at such a great price, it won’t stop most from grabbing one anyway.