[arch-general] Relicencing Wiki Content under Creative Commons

Greeting Archers, I would like to reuse and expand a Template from the ArchWiki for another Wiki. For that it would be ideal to relicence the content from GFDL 1.3 to CC BY-SA 4.0 (Creative Commons Attribution-ShareAlike). This page [1] states that GDFL v1.3 was explicitly designed to make interoperation with Creative Commons possible, but only when the content was created before November 1, 2008. And you can not use this permission after August 1, 2009, which would mean my re-licencing would be illegal. Is this correct or am I missing something here? No-one probably cares but I figured I'd ask here nonetheless. Thanks and salutations, alpabrz [1]: https://www.gnu.org/licenses/fdl-1.3-faq.en.html