Hey I'm the author and I can jump into what I actually believe:
Basically, I'm still working on integrating my experience into a rational worldview. I definitely had the experience of meeting entities and speaking to them, and that's hard to reconcile with our everyday "sober" experience of reality.
There are tons of testimonies of people reporting similar things, so that makes me feel less alone in the potential delusion of thinking it's all "real."
Whether it's real or not actually doesn't matter so much to me. The experience is the same no matter if it's coming from my brain or from elsewhere. The only thing that matters is how I live my life as a result after having these experiences.
I've made peace with not having all the answers. If you asked me "Do I believe in God?" I'd say yes. But my definition of God is probably very different from the usual one. Since I now think of God as being an emergent property of communities of people coming together and forming a social contract through shared stories, morals, and goals. Where they are trying to make sense of a shared mystery of life and capture the ineffable transcendental experience into stories and myths. Personifying that into a "real" thing is useful for some, and experiencing that personification is a very interesting phenomena that I don't really understand, yet I've had the experience myself.
Anyways, I hope that's helpful :)