Children with autism do not show social attachments, even to parents?
I think the authors got it wrong, it is untrue that children with autism do not show social attachments or attachment to their parents.
Liu, Y., Li, J., Zheng, Q., Zaroff, C. M., Hall, B. J., Li, X., & Hao, Y. (2016). Knowledge, attitudes, and perceptions of autism spectrum disorder in a stratified sampling of preschool teachers in China. BMC psychiatry, 16, 142. doi:10.1186/s12888-016-0845-2