Autism isn't as cut and dry as this. Falling out of planes and diabetic comas are truly black-and-white outcomes, but ASD assessment involves behavioral testing of social and verbal ability, which has high variability between and within individuals. The linked studies about folinic acid are not finding a binary conversion of of ASD kids from non-verbal to verbal, rather they are detecting X% increase in Y behavioral test, which is subtle and something that is found with behavioral treatment. I would love to live in a world where we discover a treatment for ASD that is as clearly successful as insulin for diabetes, but we're not there yet.