

Even in your made up scenario it doesn’t prove the negative. Maybe your mind reading didn’t work because Apple has a mind wiping device that made them forget. Maybe the crystal ball didn’t work because Apple made an even more powerful “crystal ball blocking” device. You can’t prove that’s not what’s really happening.
So no, you in fact can’t prove a negative.
That seems like an impressively blanket statement when there’s literally dozens of sugar substitutes that are all wildly chemically different. Insane that all of them would kill your mouth and gut microbiome even when they often work in fundamentally different ways.