It depends on what the nature of the pragmatics deficit is. For example, if it has to do with reading nonverbal communications, many of which are visual in nature, then comprehending fiction would not necessarily be an issue, as all of the nonverbals have to be written out; it might actually level the playing field, or even give an advantage, to readers who rely heavily on verbal cues for reading social situations. Or if they have sufficient cognition to decode social situations using rules, they might be able to figure it out in text, where you can re-read, and slow down the process, but it may still be too difficult to keep up with social perception and social cognition at speed, in live settings.
If the origin of the social communication difficulty is more linguistic, such as getting inference, figurative language, etc., then reading comprehension might be more of a challenge.
