After listening to the entire story as read by Overly Sarcastic Productions, I suddenly came up with this crackpot theory; Voldemort and his Death Deelers are actually aware of being in a bad fan fiction and try very hard to restore the universe to its canon state.
Voldemort, being one of the most powerful and knowledgeable wizards alive, realized something was wrong. The fact he now needed a broomstick to fly instead of doing so unsupported was evidence enough. He pinpointed the source of this problem to Ebony. So, in an attempt to restore the universe to normal, he attacked Ebony during chapter nine.
Sadly, Ebony's powers proved too much for Voldemort, so he decided to pick another tactic; He used legillimency (telekinesis) on her and saw how she loved both Harry and Draco. Voldemort then used this knowledge to mentally break her with a sadistic choice. Either kill Harry or let Draco be killed. Since Voldemort's fearsome reputation somehow remained intact, despite losing the majority of his powers, this threat actually affected Ebony.
His plan almost worked when he and his Death Deelers invaded an MCR concert for the second time, were it not for the fact Ebony's innate reality warping powers even managed to sway Dumblydore to the Goffic side, meaning the only wizard Voldemort feared now fought for Ebony.
When Ebony traveled back in time to the 80's, Voldemort actually followed her. Since Voldemort did not canonically have a corporeal form during said time period, the Voldemort from the 2000's actually followed Ebony back into the past and disguised himself as Tom Satan Bombodil. This is the reason why he knows what will happen in the future. He used this form to manipulate Ebony into loving him, which would make her vulnerable.
However, the shenanigans resulting from two time travelers trying to change history resulted in two timelines:
- In the first timeline (The "troll" chapter), Voldemort and Snap work together to make Ebony jump in front of a bullet meant for Lucian Malfoy. This has the desired result, as Ebony's grip on the universe is broken, reverting everyone to their canon self.
- The second timeline resulted in a Latin standoff. As Ebony's sanity started breaking under the pressure of choosing between Harry, Draco or Tom Satan Bombodil, so also weakened her grip on the Harry Potter universe. Said universe started to fall apart, which was evident in how incoherent the story became in later chapters. This meant Voldemort also slowly regained his enormous powers. As a result, he grew more bolder and directly attacked Ebony and her friends.
So, here you have it; a strange interpretation of a fanfic that no one asked for, but posted nonetheless.