Pride comes before the fall, and the AI comes before humility.
When someone states definitively what LLMs can or cannot do, that is when you know to immediately disregard them as the waffling of uninformed laymen lacking the necessary knowledge foundations (cognitive/neuroscience/philosophy) to even appreciate the uncertainty and finer points under discussion (all the open questions regarding human cognition etc).
They don't know what they don't know and make unfounded assertions as result.
Many would do to refrain from speaking so surely about matters they know nothing about, but that is the internet for you.