I read this when it was first published and I'll just continue to accept the author's assertions that they are experienced/informed/educated and point out that

I read this when it was first published and I'll just continue to accept the author's assertions that they are experienced/informed/educated and point out that the "mindfulness" style of "meditation" is entirely different from the concentration-based styles of "meditation". It at least sounds like they were unaware of the differences, and unaware that the concentration-based styles are quite well documented as tending to produce various phenomena (glorious or horrifying and all points between and beyond) on the route. Even ignoring "awakening kundalini" types of things that other commenters mentioned, this is where most practitioners would say this kind of experience is why it helps to have a "guru" for assistance.