But nobody is going to return the iPad Air. Because nobody was harmed.
And here's why nothing will come of this. Nobody was harmed. The M2 in iPA is as performant as Apple promised it would be.
Your iPad is not any bit slower because of a core that never existed.
Not to mention that customers that care about core count would probably be more interested in the Pro models anyways. If you're worried about performance, you're looking for M4, not a core count.