1. Equifax was never hacked.
2. Equifax accidentally deleted a substantial portion of their database.
3. Come up with a system to get the information they lost back, via a "have I been pwned?" checker.
3a. If you enter your details and they are not in their database, they assume it is one of the persons they deleted, add it to their database, and give you a "maybe hacked" message. Obviously a fictitious person would never have been in any of their databases, deleted or otherwise. So, assuming this fake person must be a deleted person, they add the info and show the "maybe hacked" message.
3b. If you enter your details and you are one of the lucky (haha) persons that were not deleted, you get a "you are safe" message.
4. Equifax gets a lot of their database they deleted back with little effort on their part.
What do you think?