There is no one sensory friendly diet that is going to satisfy the sensory needs of every Autistic person. It just can't be done, and people who try to tell you that they have found one are some combination of confused, lying, and selling something, probably the diet book.
One example of conflicting sensory needs: I was staying with an Autistic friend of mine, and we were eating different things from each other basically the whole time. She is sensory seeking for mint, and sensory defensive for spicyness above a threshold most people probably consider reasonable. I have exactly zero tolerance for mint, as in, I have melted down in the dentists office when the floss turned out to be waxed with a mint scented wax. They couldn't even smell it at all, and I melted down. Or I have opened the wrong bin of cookies and flipped out, running all the way across the room before anyone else realized I had opened a bin, because the smell of the mint chips was that bad. A friend had to put his nose about an inch from the cookie and inhale to smell it. So that's already rather incompatible. Now add major seeking for spiciness. I have snacked on jalapeños, both pickled and not. I still do, on a regular basis. When I make chilli, the chilli powder and cayenne powder are both measured with a measuring cup. I have been told that no one else can eat my chilli, but to me it is perfect. I have also snacked on other kinds of hot peppers. My second time in China, I went out with friends the last night, and I ate all the hot peppers out of one of the dishes. I think my record was thirteen of them in my mouth at once, chew, swallow. No one else was even able to eat one. When I say I a, sensory seeking for spicy, I mean it.
Or different people will have different texture needs. Or some people do have celiac or milk allergies or other kinds of intolerance that they need to work around in addition to satisfying the sensory needs. There is no way to do it with just one diet to fit all of us. That might be why when a bunch of Autistics get together, you see a bunch of different kinds of food. We are all trying to satisfy our different sensory needs.
For me, I have my complete intolerance for all things mint, my seeking for most things spicy, seeking for something about olives, and then the rest is mostly textural. Pasta has a great texture. Refried beans have a kind of bad texture. Scrambled eggs are horrible. Hard boiled are the only eggs I can choke down, and even then it's bad. Yogurt is inedible. On bad sensory days, pudding joins it there. Carbonated anything is impossible, even when it's "flat."
My sensory issues are mostly not a big deal as far as finding food goes, though I think that has more to do with always having been allowed choices in what I eat than in the number of things I can eat. There are plenty of healthy things I can have, and I always got to focus on those rather than needing to choke down the ones I can't eat. (Well, except when I was on antibiotics for whatever reason and I was supposed to eat live culture yogurt. Pain. Pain and misfortune. Alas and alack. Bad bad bad bad bad. Yogurt is made of fail. It needs to remain in other people's possession, not mine. If that can't be accomplished, then it needs to be banned.) Cream cheese and cottage cheese are just as bad as yogurt, if not worse. I don't even like to touch cream cheese. It's disgusting.
My sensory issues might be part of why I eat dinner leftovers for breakfast instead of eating typical breakfast food. A lot of the things I can't eat are considered part of breakfast foods, after all. Yeah, I'm just thinking in print right now. I'm not super articulate all the time.