Even as a layperson, I've noticed that all roads seem to lead back to Linda Silverman with this idea of visual-spatial learning. She seems to have built her name on this concept, but as far as I know it's never been validated by a solid body of independent research, just as the idea of learning styles in general isn't well-supported by research. I'd therefore read anecdotes about this stuff with interest, but still take it all with a grain of salt, especially assertions of supposed fact.
Instead of reading books about an unproven idea, and acting based on laypeople's advice from a few test scores, I'd follow up with your tester and other professionals to find out more. Specifically regarding this visual-spatial stuff, I'd want to get at least an opinion from someone who's not connected to the Gifted Development Center or Linda Silverman, who is director of the GDC. It's not that I think they're bad for advice in general on giftedness, it's that I suspect that they may have tunnel vision on this visual-spatial learner concept.
If your child has sensory or learning issues, I think it's necessary to learn further about them outside of this visual-spatial learner paradigm. You don't want learning disabilities or other disorders to be dismissed as just symptoms of someone being a "visual-spatial learner".