I would expect Siracusa to have read books in the past. Possibly more than a handful. Books tend to be indexed by page, teaching readers to remember their position through pages when not using book marks for whatever reason (or when said book mark falls out)

This would lead Siracusa to have an easier time remembering his position through page number due to his personal experience. Note how that's exactly how he worded it, that he preferred page breaks because he can remember it better? At which point "MatthewPhillips" asserted Siracusa was plainly and simply wrong?