This article doesn't appear to describe mystical experiences.
I caught that the author doesn't even know what they are, using language such as, "a weird combination of pronounced alertness without thinking content", sounding so foreign to their experiences. And also, a very limited understanding of things like meditation, for instance where they state, "Other than during still
meditation, when a person focuses exclusively on a single action or series of actions so ingrained that they need no conscious attendance to the movements."
This also a misunderstanding of the topic. First, it reduces all mediation to single-pointed focus found in concentrative paths of meditation. It excludes all of Insight or awareness meditation which is defocal in nature. And in the case of "flow states", which the author appears to have little understanding, it is not due to single-pointed focus. Those happen when you don't focus on a single object at all. It occurs when awareness expands to include everything it perceives, without drawing attention to single objects.
I got about that far into the article when I saw where this was heading.