Neoteny, one of the three directions of heterochrony, would seem at first appearance to be a blow to the 'Cannibals selected for non-cannibalism hypothesis' for autism. It's neotenous nature led it to register www.originsofautism.com before anyone else, yet it fails like all the others in that appears to be describing 'a subset of the tools in the workshop' rather than 'the reason for the kind of bicycle being constructed', as an explanation for the causation of a particular kind of bicycle, widget or person.
However, in case you missed it, neoteny is taken as a sign that cannibalism will not occur, and so it is preserved while the more ogrish amongst us are forced from the face of the earth.
Another perhaps less chilling explanation for the increased prevalence of neoteny in autistic populations is that autistic people behave inappropriately i.e. they make social mistakes. A social mistakes' cost is measured in terms of the consequences meted out, whether officially or otherwise, by society. Those who look young, child-like or pretty are more likely to go on to be allowed to build a family despite their social faux-pas.
This is also why cannabis for autism is facing formidable opposition. It is highly likely that the more intelligent, more attractive females asperger's are the ones least likely to have need for medication, the ones most likely to oppose the use of any medication, the ones least likely to understand the point of view of those in need of medication, and the ones who have most influence over the general public at large.
Cannabis for Autism Angels Required. Apply on Facebook.