RE: Impermanent Loss: The one topic every crypto website somehow explains incorrectly.

It is very clearly implied (and in many cases explicitly stated) time and time again that arbitragers are the ones causing impermanent losses.

I still don't see that in the example you showed. I mean they say it explicitly, but it is just an example. They definitely could use another example (like someone buying just to hold) to explain the exact same steps.

During this process, the profit extracted by arbitrageurs is effectively removed from the pockets of liquidity providers, resulting in impermanent loss.

This sentence starts with "During this process". They are just showcasing a particular process where an arbitrageur uses a pool.