Assuming that the hypothetical anarchist solarpunk society is rather small and tight-knit, I’d imagine that autists would have it easy. You know a guy who’s unusually interested in trains? Send him off to train (lol) under a master engineer, and he’ll never work another day in his life around people who don’t understand him. Obsessed with history? Work as a historian.

I imagine that these societies could have a more transparent social fabric and, thus, a simpler job system. Everyone would know each other or know someone that knows them. With no corporations to obfuscate things, you could just call up a guy or gal and they’d give your autistic friend or you a chance.

In an intentionally planned society based on high trust and respect, there’d be no social posturing and BS. You could work all your life and never talk to anyone. Trust would be implied in all that you do, and an autist would never have to explain themselves. It all stems up from culture and how everyone relates to each other.

In regards to your food texture problem, just have the town cooks whip up some dino nuggies. Lol.

But for real, I don’t see why, outside of a logistics problem, you wouldn’t be able to have any food that you liked. And if you’re really concerned about nutrition, the town’s professional chefs could figure out a culinary solution that suits your needs. Maybe this is kind of handwavy, but there’s no one-size-fits-all solution. Unless, of course, you want to drink something like Soylent Green every day. :D