Ariana suffered frequently from Self-substantiation; the act of a person developing an awareness of the Matrix without any external help. Unable to comprehend her visions (and because wizards already have a hard enough time unplugging) it drives her mad.
This could also explain why Albus is so peculiar; he is fully aware of the nature of the Matrix - having figured it out through her and other means at a young enough age where it didn't drive him mad - but as a wizard he went completely unnoticed by the unplugged humans and ordinary Matrix security.
The D.A. will all be unplugged.
Both in-canon and in the
Know Thyself series, it is established that people are only unplugged up to a certain age, the longer a person having lived in the Matrix the less they would be able to handle the reality that the lives they lived were all a falsehood, Neo being unplugged at his age being done as an exception because of the potential Morpheus saw in him.
In Know Thyself, Harry is given a mission to learn more about the Wizarding World, learn all of the magic he can so that he could apply those skills into the real world and use them in the war effort against the machine. His other mission - as was the basic mission the Nebuchadnezzar - was to venture into the Matrix, find more redpills and unplug them. Redpills are people who see through the falsehoods of the matrix and agree to be freed from it, everyone in Zion either having been freed with the help of people who have already been freed (as was the case with Harry) or freed themselves via Self-substantiation
. Harry intends to socialize with the student body and find someone who has any of the telltale signs of a potential redpill.
If canon is anything to go by, Harry will start with Ron and Hermione, maybe add Neville, Ginny and/or Luna to the list until his entire entourage has been unplugged, they destroy Voldemort before he crashed the Matrix and they all work together to help Zion take back the real world.
The Oracle expressly said that Voldemort's code was scattered (a reference to canon's establishment of Voldemort's could being separated into Horcrux's), so it is very likely that if Voldemort was never a regular human being infused with some of the Matrix's code (like The One), then Voldemort was always a program who's job was to act out the "Dark Lord" narrative. Then - much like how Agent Smith was destroyed in the first film and reemerged as a virus free of his programming in the second film - Voldemort was destroyed when he went after Harry (probably because he was never meant to clash with The One and it screwed with his code) and needed the help of his Death Eaters to return to full-function, his monstrous appearance a side-effect of his broken code.
The
Dénouement will feature the unplugged wizards undoing the permanent storm clouds in the real world.
