So that said, I'd say modern best practices are still agile. The trick is recognizing and convincing an organization they aren't actually practicing agile, they're practicing cargo cult agile, and to get them on board with the necessary changes.
That said, if anyone has any good resources on how to explain and affect that change, convincing higher ups who believe that they're already agile that in fact they're just cargo culting it, and to instead implement the scary changes that are required to truly be agile, I'd be interested.
I totally am in agreement that you have to treat it as some new thing (rather than them just doing the old thing correctly, instead of incorrectly as they have been), but even assuming they were on board to consider it, it gets tricky. Do you just rebrand agile? Then they're going to screw it up the same way. Do you take a more prescriptive approach, that this new 'eliga' (agile spelled backwards) process means we do it -this- way? Because then you're not really doing agile, and teams that need to operate differently are not going to be as productive. Etc