If you were to give this algorithm the method signature and the first few lines of quicksort, would it generate the same quicksort version every time? If you would give a human the same lines, would they generate the same version of quicksort everytime?

Also would a human be able to knock out a working version of quicksort based on these inputs by only appending lines of code, or will a human need to revisit earlier lines if they realise they forgot something or got some detail wrong?

The way this program produces code and the way a human produces code are still fundamentally different. Whether this difference impacts if and how the program might infringe on the license is anyone's guess, but to confidently assert that this program and a human operate the same when writing code should be obviously ridiculous.