DC hasn't actually rebooted since 2011 (and they claim it wasn't a reboot, but that's nonsense. Yes, some things held over, but Zero Year proves that ultimately, it was supposed to be a reboot, just a half hearted and poorly executed one). Rebirth wasn't a reboot, just a linewide relaunch that made some parts of continuity available again, and Infinite Frontier wasn't even a linewide relaunch so much as a linewide marketing event, sorta like One Year Later, that makes the rest of continuity available again. Basically, the n52 was a reboot, but Rebirth and Infinite Frontier were not.