I agree that we can find academic examples of the usage wherein we find strong and weak atheism, explicit and implicit atheism, positive and negative atheism- these modern views are dwarfed by the number of scholarly articles we can find that define atheism like this:
"Atheism is a-theism. So: 'a,' hyphen, 'theism.' An atheist is someone who does not subscribe to the central tenets of theism. The “a” is an alpha privans, it denies what follows. So an atheist denies what the theist tries to confirm."
Cliteur, P. (2009). The definition of atheism. Journal Of Religion & Society, 11