A nation of guinea pigs
It sounds as if this was done in Israel, and as far as treatments go, hyperbaric chambers are about as non-invasive as it gets. Pressure isn’t always high, although the psi used in these treatments isn’t mentioned.
I think this is a pretty decent idea. It’s better than any chemical intervention they could come up with, non-invasive, and some of the Autistic kids I know might actually appreciate the isolation.