This area is in research. Presently there is no convincing evidence that it can be used in treatment of Autism.
Here are few articles about research inAutism.
Siniscalco D, Kannan S, Semprún-Hernández N, Eshraghi AA, Brigida AL, Antonucci N. Stem cell therapy in autism: recent insights. Stem Cells Cloning. 2018 Oct 23;11:55-67. doi: 10.2147/SCCAA.S155410. PMID: 30425534; PMCID: PMC6204871.
Cheroni C, Caporale N, Testa G. Autism spectrum disorder at the crossroad between genes and environment: contributions, convergences, and interactions in ASD developmental pathophysiology. Mol Autism. 2020 Sep 10;11(1):69. doi: 10.1186/s13229-020-00370-1. PMID: 32912338; PMCID: PMC7488083.
The bottom line here is that it is not the holy grail resolving a therapeutic reversal of ASD. that some of its advocates proclaim. Additionally, there is still a huge amount to learn about what causes ASD as well as to how stem cell transplantation could have an effective and beneficial role. A very useful review has just been published in Developmental Medicine and Child Neurology by Sun and Kurtzberg.
Stem cell therapies in cerebral palsy and autism spectrum disorder
This a very disturbing thread. Are people suggesting that autistic people need to be 'cured' or 'reversed'? Autistic people, although a minority, are highly valued humans, reflecting the biological diversity of life. The barriers they face are the result of an environment that fails to be inclusive. Suggesting a therapeutic or medical reversal sounds equivalent to offensive and harmful practices such as conversion therapy?