Beware! That blog was created a few days ago solely for marketing AI-written books. (Just check the about site: "Sample introduction · Replace this with your personal bio.")

To be honest, I'd be fine with some AI-assisted writing and might even be interested in reading one of those. The scientific sources seem to be researched well, not hallucinated. But asking the author "Alexander Crespo" under a reddit post, to what extent they used AI in writing, results in them blocking you. Makes me think it is more AI-generated than they wanna admit.