If you think of AI as a dial from sample(data) to mean(data), then as the dial is turned towards the mean() you get more "generic" results, but also more garbled ones.
Copilot is more like a search engine, having turned the dial more towards sample().
The real invention of the NN is simply to provide that dial in a trainable way.
The only change to the "state of the art" is the size of the weights, and how long they take to train. This "advancement" is no more impressive than google indexing more webpages.
There has been no step-change advancement in AI in, perhaps, 50 years. All we see today is a product of hardware, in GPU/CPUs able to compress TBs of data into c. 300GB of weights. And likewise, the internet to provide it and SSDs to hold it.
The "magic" of AI is no more the magic of wikipida, here: copilot is good only because million+ programmers made github good.
It's still little more than a fancy search.