batfan08
Super Freak
The fact that it's beginning depends on the flashpoint event doesn't mean it's not a beginning, it's simple, if something didn't use to exist, and then it came into being, then there has to be a beginning.
It's not, though. It's a continuation of the Pre-52, in that it utilizes the same Flash. He's melded with it, but, as we've seen, he's still the same Flash. He's lived, he's died, he's lived again, and he's changed his timeline, but the fact of the matter is that, linearly, no matter how you put it, the original continuity came before the New 52, and, as such, the New 52, as different as it may be, is a continuation of the original continuity. If it was a straight-up reboot, I could see your point, but Flashpoint acted as a buffer, and transformed the Pre-52niverse into the New 52 U.
If the OG Universe was a road, Flashpoint would be a fork in the road. The Pre-52niverse would continue in one direction, and the New 52niverse would continue from another. No matter which road you wind up on, they both started in the same place: a place where the Justice League of America first formed to face Starro the Conqueror in The Brave and the Bold #28.