I don't think it changes much about licensing in particular. People are going on about how since the AI was trained on this code, that makes it a derivative work. But it must be borne in mind that AI training doesn't usually lead to memorizing the training data, but rather learning the general patterns of it. In the case of source code, it learns how to write systems and algorithms in general, not a particular function. If you then describe an interface to it, it is applying general principles to implement that interface. Its ability to succeed in this depends primarily on the complexity of the task. If you give it the interfaces of a closed source and open sourced project of similar complexity, it will have a relatively equal time of implementing them.

Even prior to this, relatively simple projects licensed under share alike licenses were in danger of being cloned under either proprietary or more permissive licenses. This project in particular was spared, basically because the LGPL is permissive enough that it was always easier to just comply with the license terms. A full on GPLed project like GCC isn't in danger of an AI being able to clone it anytime soon. Nevermind that it was already cloned under a more permissive license by human coders.