The 2nd point in the blog post you present as a source is factually incorrect:

2. Artificial sweeteners contribute to chronically high insulin.

The link (bolded by me) in the following text

One of the most commonly used artificial sweeteners in diet sodas, aspartame is particularly damaging to the brain.

Goes to a page titled "Can Sugar Affect Your Cognitive Ability?". They didn't even link to the thing their text is claiming.

How can you take this trash seriously?

And personal anecdotes are absolutely worthless in discussions like this. Artificial sweeteners are consumed by a massive portion of the population. Any person who falls ill is likely to have consumed artifical sweeteners, so they will have incredible correlation with every disease on the planet.