User blog comment:Itamar20112/My thought on the wiki post-crisis announcement/@comment-43707041-20200116225330/@comment-2054358-20200122220916

And the new Arrow episode gave us a ring designed by Cisco with the help of J'onn's powers that would wake people's pre-Crisis memories. How is it supposed to work if they are not the same people? The 20 years between the present and future has changed so drastically that Mia and JJ may as well be doppelgangers, but the ring worked on them!