Aizen's words undoubtedly proved one thing: he was Aizen Tokiomi, the super-big boss whose stunning performance in the Light Screen footage of the Fourth Holy Grail War had shocked the world.
In a daze, people suddenly realized that although the Light Screen footage had shown the story of past timelines and even included "what ifs," the currently ongoing timeline was the third timeline—the one in which Aizen Tokiomi existed!
During the Fourth Holy Grail War, he had fulfilled his plan and gone to the Void God Realm where the Void Outer Gods resided. With an overbearing presence, he had begun a campaign of conquest there, only to vanish without another word afterward, leaving everyone wondering what had become of him.
Yet now, he had appeared, and the place where he appeared was the world of Infinite Tsukuyomi—the place where Fujimaru Ritsuka and the others were.
And the method was "entering a dream."
At least, that was how it appeared.
This made people in the real world blurt out the exact same complaint Hashirama Senju had made in the Light Screen footage—was this Infinite Tsukuyomi world some kind of public restroom? Anyone could just barge in to piss and shit.
As the person most "persecuted" because of Aizen Tokiomi, Tohsaka Tokiomi instantly felt his PTSD flare up. It was as if he could once again hear countless people muttering in his ear, "It's all Tokiomi's fault," and, "You're trash compared to Lord Aizen."
Cold sweat from his extreme discomfort immediately poured down, leaving Tohsaka Tokiomi utterly miserable.
Tohsaka Rin beside him, on the other hand, was not nearly as conflicted. Her eyes instead lit up, only for a trace of wistfulness to follow.
After all, even if it was Aizen, he was still Aizen Tokiomi—her father in another timeline, in a