== Is the citation notice compatible with GPLv3? ==
Yes. The wording has been cleared by Richard M. Stallman to be compatible with GPLv3. This is because the citation notice is not part of the license, but part of academic tradition.
Therefore the notice is not adding a term that would require citation as mentioned on:
https://www.gnu.org/licenses/gpl-faq.en.html#RequireCitation
The link only addresses the license and copyright law. It does not address academic tradition, and the citation notice only refers to academic tradition.
[...]
https://git.savannah.gnu.org/cgit/parallel.git/tree/doc/cita... Does the GPL allow me to add terms that would require citation or acknowledgment in research papers which use the GPL-covered software or its output? (#RequireCitation)
No, this is not permitted under the terms of the GPL. While we recognize that proper citation is an important part of academic publications, citation cannot be added as an additional requirement to the GPL. Requiring citation in research papers which made use of GPLed software goes beyond what would be an acceptable additional requirement under section 7(b) of GPLv3, and therefore would be considered an additional restriction under Section 7 of the GPL. And copyright law does not allow you to place such a requirement on the output of software, regardless of whether it is licensed under the terms of the GPL or some other license.
https://www.gnu.org/licenses/gpl-faq.en.html#RequireCitation
They do different things. The electric fence is for keeping animals in/out and the retaining wall is for keeping soil from moving. Sure you may add the retaining wall but you've still removed the electric fence so the foxes can now get into your chicken coops or your cows are running free. That's chesterton's fence. Even if well meaning, making a change that fails to replicate/fulfil the original purpose of the original fence causes the issues to return.