It's not a pure "if you don't know SFINAE you're out" but it gives you a very strong indication of which parts of the language they're actually familiar with (a

It's not a pure "if you don't know SFINAE you're out" but it gives you a very strong indication of which parts of the language they're actually familiar with (although maybe it's a little dated now), and for a lot of candidates you could go through a list of dozens of these acronyms and they wouldn't be able to reasonably identify any of them.