I'm glad you enjoyed the game.
As for the story, I won't confirm or deny it, but I will say that your theory may be on the right note.
The sentence in another language (Czech) is a reference to a famous meme here in the Czech Republic.
Itoru but especially Anna are characters from my other games (even though this game isn't particularly connected to the stories of my other games, I couldn't resist putting a little reference at the end).
And yes I am a Neuro fan.