I don't think he meant "show the actual data," I think he meant "what leaked? My name, address, phone number, email, medical records, payment history, bank account number?"

We get a "your private data is now public" email, but knowing exactly what data turns that from a depressing statement on how much corporations value their customers' privacy into something actionable.

This information is shown on the site of the breach, as example: https://haveibeenpwned.com/Breach/BakerDistributing

Yes, I meant the actual data so you know what leaked. There is a difference between leaking a password 12345678 and leaking a password that was reused on a different site. There is a difference between leaking your actual birthday and leaking 01/01/1900. There is a difference between leaking a fake address, your previous address, and your current address.