If I as an alleged human have learned purely from GPL code would that require code I write to be released under the GPL too?
We should probably start thinking about AI rights at some point. Personally I'll be crediting GPT-3 as any other contributor because it sounds cool but maybe morally too in future
A machine learning isn't really the same as a person learning - people generally can code at a high level without having first read TBs of code, nor can you reasonably expect a person to have memorised GPL code to reproduce it on demand.
What you can expect a person to do is understand the principles behind that GPL code, and write something along the same lines. GitHub Co-Pilot is not a general ai, and it's not touted as one, so we shouldn't be considering whether it really knows code principles, only that it can reliably output code that fits a similar function to what came before, which could reasonably include entire blocks of GPL code.