Imagine this, if you will. Twilight and co. defeats Discord and Twilight is rewarded with Alicron-ness. Then, the plunder plants fiasco happens and Discord is released after the Mane 6 give up the elements. From there, Discord decides a change in tactics is required and a cold war of sorts between harmony and chaos in Equestria begins.
Yes, the text doesn’t say a word about the wings.
It does not actually say anything about the wings as far as I understand. That’s justt art thrown in.
Twilight has done important, impressive things. Finishing that spell wasn’t one of them.
Basically, the whole left page is a summary of how Twilight figured out to “un-discord” her friends and how Diskord got defeated.
The right page is Celestia congratulating the Mane 6 for saving the world from chaos.