Nevertheless, this connection isn’t always consistent, and some experts have argued it isn’t gut bacteria that trigger ASD, necessarily; it could be that kids with autism are more likely to restrict their diets because of ‘picky’ eating, which in turn influences the kinds of bacteria that persist in the digestive tract.

That seems like a huge tell that it’s still very much inconclusive. I have ARFID which is one of the comorbidities associated with ASD. I can absolutely tell you that there are more foods I can’t eat than can.