Here's the definition of atheist according to the first google result: a person who disbelieves or lacks belief in the existence of God or gods. This describes me perfectly, therefore I was not mistaken. However, the post is essentially about the imprecision of words, so kind of ironic that you're fixating on definitions :)
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https://en.wikipedia.org/wiki/Atheism
As you can see Atheism is the belief that no such Deity exists. Theism Is the belief that such a Diety does exist. Agnosticism is to not have the evidence to believe either with certainty.