I didn't see the part about visualizations and to my knowledge they are considered a distraction to the practice of meditation and not to be sought after. I was actually thinking the opposite for the cause of the perception of "the chamber of guf" that it results from the suppression of the default mode network and the decoherence of other organizing factors in the mind. To use the metaphor of the article, you ask the Angel to stop promoting just a few of the thoughts and instead just leave the door open so you can listen to their murmuring.