Oh, well if you dont think it's real, then you must of course be correct.
You don't know anyone with autism do you?
You've never been faced with a child who would actually just choose to not eat, rather than eat the "wrong" option?
Not cry about it. Just say "er, no thank you" and actually mean it. They would rather eat nothing and carry on with whatever they were doing before you interrupted them about meal breaks.
In my experience, sibling ate ok as a baby. The "pickiness" presented from toddlerhood. When parents are worried about what a child will eat, they'll typically offer a variety foods in the hope that something will be a winner. When they find a winner it's added to the list and you hope to find other winners.
Unfortunately, your ND child will latch onto the safe foods they've identified for taste/texture/satisfaction purposes. Now they will only eat those specific sausages, that bacon, those mini baguettes that you finish in the oven, specific microwave fries, specific brand of ready salted crisps and Cadburys dairy milk - the thin bars. They won't eat meals. They will eat 4 sausages on a side plate.
You'll find yourself going on holiday with a suitcase full of magic crisps, in case child won't eat anything - but not to worry you'll discover that they love pitta bread and tarmasalata of all things. Perhaps some donner meat. Oh how you wish they could be this passionate about apples or cucumbers.
You'll worry throughout their childhood that they'll end up malnourished, or develop horrible diseases from their poor diet. Yet by some miracle, they'll grow to be the tallest in the house.
If you're lucky, when they get older they'll be a little bit more curious about other foods and may even let a vegetable (roasted onion!) pass their lips. But they'll still be pretty rigid and "no thank you" about food.
I didn't grow up in a house of ready meals and fussy eaters. We had plenty of fruit and veg amd ate what we were given, but the young one would not touch it. I don't know what the alternative would've been? Tube feeding? Starvation? Assault?
You're insinuating that a child's recognised condition is down to poor or lazy parenting. Which is highly offensive.