Well, I don't know if you're serious or not but he had the biggest writing role in PoE1. If you or anyone else hadn't heard of him its probably partly cos of Obs used more well known devs on marketing/panels etc despite they may have had lesser roles in the development of PoE.
Okay, he's a writer. I'm still not clear why all the excitement.
I thought Eder was well written in PoE 1, so if the same guy is writing him for PoE 2 that's good news, regardless of the fact that I've never heard of him before.