No this is just a very overly pedantic and technical way of looking at it.
First of all you'll note that all people are also biased by the Exact same reasoning. You know this. Everyone knows that all people are biased. This isn't something you don't know.
So if every single intelligence, human or not is biased. What is this article truly talking about? The article is basically saying LLMs are LESS biased then humans. Why are LLMs less biased then humans? Well maybe because the training set in an LLM is less biased then the training set given to a human. This makes sense right? A human will be made more biased by his individual experience and his parents biases while an LLM is literally inundated with as many sources of textual information as possible with no attempt at bias due to the sheer volume of knowledge they are trying to shove in there.
The article is basically referring to this.
But you will note interestingly that LLMs bias towards textual data more. They understand the world as if they have no eyes and ears and only text. So the way they think reflects this bias. But in terms of textual knowledge I think we can all agree, they are Less biased then humans.
Evidence: an LLM is not an atheist or a theist or an agnostic. But you, reader, are at the very least one of those three things.