The book seems to be a parody of the book No Easy Answers The Truth Behind Death At Columbine, written by Brooks Brown and published in 2002. Only three years after the tragedy. The title was changed by Khyle to The Columbine Groomer to make reference to past events in this series of Evangelion drawings made by him. (See post #5780469, post #6057709, and post #6186480 for additional context.)
With all this said, I'm assuming Asuka is in the podcast to speak about her testimony about all those events, because as you noticed, she was present in the posts I shared.
