Lili's astounded thought for the day

Is this paper science based on sound foundations? Listed in the references you can find Daniel Tammet’s first book, both of the 2007 studies of Tammet by the Baron-Cohen team and this paper's author’s own paper about Jason Padgett, a neurological case who has been viewed as similar to Tammet, and a magazine article co-authored by this paper's author about Derek Amato, another supposed case of acquired synaesthesia with acquired savantism. "Quicksand" and "Ouroboros" are two words that come to mind.