> And don't just rewrite the same code from memory, but instead write fully new code producing the same/similar outputs.

How different does the new code have to be from the old code and how is that measured?

nobody can tell and this is how we entered this very turbulent modern times of "everything can be retold" without punishment. LLMs already doing it at large, while original author is correct in terms of the LGPL, it is nearly impossible to say how different should expression of an idea be to be considered separate one. this is truly fundamental philosophical question that may not have an easy answer.