I have a theory that this is caused by the low layer/process modulation in the Default Mode Network of the brain caused by psychedelics. Check out
this thread to see what I mean, specifically in the lower levels of the neural network that deals with edges and lines and colors (the google AI is analogous to the DMN of the brain in my analogy). Perhaps the language centers AND the visual centers experience this recursive processing effect that Deep Dream by google has been made to mimic, such that the result are lines and edge distortions/geometry that also has a linguistic perceptive component. The effect is a feeling of language intuitively without any real meaning or syntax (like how a child draws nonsense characters and squiggles in an attempt to mimic writing, except that the tripping brain is infinitely more articulate than a child's underdeveloped motor control in it's ability to accurately synthesize language-like images.