Literally nobody. This is confusing atheism with agnosticism.
Or, if I’m being charitable, they’re confusing the starting position and the conclusion. If you start from a position of neutrality and follow evidence-based reasoning, the conclusion is either atheism or agnosticism.
I’ve always understood the colloquial meanings in practice today to be that atheism is active disbelief where agnosticism is essentially choosing not to choose (for lack of information).
I understand your point, linguistically and philosophically, but I don’t really think that’s how most people - even atheists and agnostics - use the terms today.