You can easily and correctly find things saying “we don’t know if aluminum causes dementia” but this is because there’s a high burden of proof regarding “how?” in order to declare something a causal link.

What is definitely true: there is a strong and obvious link between aluminum and dementia, though how it is caused to exist is uncertain.

If you believe the simple solution is often the correct one here’s the simple answer: cooking and eating with aluminum leads to dementia. Is this proven? No. Is it likely to be at least a part of the truth, whenever that is known for sure? Yes