Uh no. Its Pre-Flashpoint. Wally's memories from DCU: Rebirth explicitly show the Pre-Flashpoint Flash family and Pre-Flashpoint Titans and his Pre-Flashpoint wife. Plus, you know, the Superman who is 100% Pre-Flashpoint Superman returning and, of course the revelation that this is his world just altered.
Also, its not just vague elements. Its actual events from past story arcs from before Flashpoint. For example, Damian recounting what happened to Grant Wilson (which tracks with New Teen Titans #2 and disregards the New 52 version of Grant Wilson who was still alive). Also, the current Doom Patrol makes explicit references to Morrison's run, ignoring the New 52 versions of the Doom Patrol characters.