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More likely, a credential leak/hack from a website (or a compilation of them). These BDs have been on the market for some time, and this sort of email has a bunch of variations that have been used for a couple of years now.
The fact that, in my case, they displayed an email/password I havent used for years (although I still received emails on it, until I closed it down recently), goes to show that the list they compile is not sophisticated, nor necessarily up-to-date, and probably cheapish to acquire in bulk, and blindly target many of them with this kind of email. Some will bring people into a state of panic if the password is recent or current on some site, and thats when one may make mistakes.