You're confusing your perception of how your mind works with how your mind actually works.
Simply put, we have no idea how the human mind works. For all we know, its underlying principles could be very similar to LLMs, or they could be something nobody has thought of yet. But under no circumstances is human intuition about the human mind a reliable indicator for what is actually going on.
This is like asking ChatGPT why it came up with a specific response. It will give you an answer, of course, but that answer is generated the same way all its answers are – ChatGPT doesn't suddenly turn on a magic "introspection mode" that allows it to examine its internals. And there's no reason to assume that humans have such an introspection mode either. In fact, many results from experimental psychology seem to indicate that humans don't understand their own mental operations at all.
What we cannot do is make definitive claims about neurological processes and structures based on what we know about our cognitive processes.
Is there any actual evidence that our so-called reflections on our own thinking are anything more than hallucinations?
"It's obvious" doesn't count as evidence.
These studies confirm our perception that we can forget stuff.
One is a general statement of fact, the other implies introspection of one's own individual cognitive processes. I have yet to see evidence that the latter is actually possible.
The phenomenon of people forgetting stuff is not subjective. It's not one person in isolation thinking they just forgot something. Forgetting is a phenomenon on which there is a lot of social feedback and repeatable experiments.
You seem to be denying the possibility of ever connecting science back to individual perception. Denying this makes any and all science completely meaningless though.
It's not limited to observations about ourselves. You could ask the question "but aren't you hallucinating?" about absolutely everything required to verify the outcome of a physics experiment for instance.
LLMs notwithstanding, I have yet to see a replication of the human mind created by humans. Therefore, I would take any claim that neuroscience 'understands' how the human mind works (a claim that I've never heard from an actual neuroscientist) with a huge amount of salt.
Not that it matters, but for various reasons I have spent quite a lot of time around neuroscientists and I think most of them would agree that "no idea" is a pretty ridiculous way to characterize the state of the field.
These things are very different. The mental model I have is that they put the entire book into a big hypercube and then *flash*, instantly, out comes the next token. And likewise, when they encounter text that is 8001 tokens long, token #1 is completely erased, gone, like it never existed.