The really interesting question (at least to me) is to what extent that observation is also true for humans.
I mean, we humans presumably built up our big corpus of human language/knowledge all on our own over the lifetime of the species, which GPT-3 currently cannot do, but.. to what extent does human thinking just consist of probabilistic re-mixing of words, phrases, and sentences that we've seen before, that came to us through our continual training on segments we've been exposed to from that big 'dataset' of human knowledge, and the best of which then get contributed back into that dataset? How much more than that is actually going on, for us?
If what GPT-3 is doing shouldn't really count as 'thinking' (as seems intuitive to me, personally, though others may certainly disagree), then to what extent can we say that humans do anything qualitatively different?
¹ Like in "it is not true, so let's prove it first and then brag about it"
However, when you give GPT-3 the opportunity to iterate on a strategy, by asking it to follow each step of the strategy sequentially, you can see its behavior become much more similar to basic human thought.
I don't know if this is correct, and I doubt it.
Your brain also just "creates the illusion" of understanding. It's slightly better it to the outside world, and a lot better to itself. But it's really just a matter of degree.