I don't understand this sweeping statement by the author (who seems between the lines to be struggling with her own issues of faith and belief, and hence had to write a book about how gullible humans are).
Is she saying that something, once explained, can no longer be divine?
My direct answer: yes. IMO divinity is just magic backing a particular narrative. As we discover and accept alternative explanations for why things are the way they are, that magic disappears and the narrative loses power.
See here:
I'm also certain that I could (and have successfully) argue the point that religion and divinity and a relationship with god are in no way affected by scientific knowledge, regardless of what some fraction of very religious folks would have you think (I do not mean that I could argue successfully with that particular fraction - just those who are on the fence on the matter).
Which is, of course, not to say that said event cannot be wondrous, or awesome, or terrible. Just that it can no longer accurately be considered divine.