Like others have said, I feel like the fiction thing is misleading. If you want to cover yourself legally, you should use something more like this
"Empirical" is not synonymous with fiction. "Bullshit" is. If someone tells a story about a giant frog that ate his cat, his friends are likely to say "He was just bullshiting", meaning "His story was fictional". If you're trying to present a book without bullshit, you shouldn't tell us it's bullshit right at the beginning.
It's not entirely accurate to say that "visualization has nothing to do with hallucinations". It actually has quite a lot to do with hallucination.
Also, where you say "If you came here because you have no friends in real life", I feel like you're alienating a fairly large chunk of the community.
Interesting to see that Vipassana has caught on. I think you could just as easily call this a book about Vipassana as a book about tulpas. But it's up to the reader whether that's a good thing.
All that being said, there is a lot of overlap between Vipassana and forcing, and following the practices of Vipassana and of this book will help many hosts.