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GNU's own page on GNUnet https://www.gnu.org/software/gnunet/ redirects to gnunet.org, so I would think that it is associated with the GNU project.

GNUnet is AGPL as well.

As another comment[1] mentioned, the software is mentioned in gnu.org as a GNU package[2].

[1] https://news.ycombinator.com/item?id=21672653

[2] https://www.gnu.org/software/software.html

The connection is more clear in this sub-link imo: https://www.gnu.org/software/network/

It links to a Savannah page that links to gnunet.org

e.V. or eingetragener Verein, is a registered non-profit organization that must serve a good cause, imo. Usually used for sports, culture, science organisations etc. It's not a company