I would have thought the only thing that matters is how it is used in the game in question, not how it is used in other games. So if SE decide that 'all group attacks on things that may or may not be underground' are called raids then that is how we should refer to it even if the term has different meanings in other games.

As an example, a Lancer in XIV is a DD class but in Tera it is a tank, does that mean one game is wrong and the other right? I am sure there are lots of other examples.