That’s no guarantee this is 100% the case, but the anti-Lost analogy seems to indicate this isn’t going to be a case where the information slowly rolls out over the course of the entire season.
Either that, or it’s a very sneaky way to indicate the explosion wasn’t actually caused by Adrian Chase, but rather an electromagnetic disruption after someone failed to enter a code on a computer.
This is good news for fans of Arrow who might’ve been worried the Lian Yu incident would be a mystery throughout all of Season 6, as it would appear that Stephen Amell kept on the writers to resolve quite a bit of it if not all during the premiere episode.