I think the idea is to use awareness of GNU and also to focus the attention of people with the skill to contribute on neural-networks.

What I mean is, you're right of course, there's much better neural-network free software already available, but GNU endorsing an official package 1) could get people whose concerns are more strongly geared toward free software ethics to start paying attention to neural networks, and 2) get people, regardless of their ideological commitment to anything, to be more aware both of the ethical issues and of neural-network software--just in virtue of GNU's mild fame.

and of course, unless the maintainer of this package makes weird choices and alienates other projects, there's the other benefit of projects learning from each other and poaching code and strategies for the greater good.