It all depends on how you look at it and if you want to potentially annoy the original coder. KenL released his code under the GPL but then due to his disagreement with how SmiteWorks licensed their own code, he withdrew all of this code from the website. When it was added back in by moderators (because it was GPL released code, so the moderators were within their rights to do so) he complained - essentially he revoked the GPL, which is against the GPL itself. More details in the second part of this post:
https://www.fantasygrounds.com/forum...l=1#post423650
My opinion is that the code was released under the GPL and that can't be revoked. Any code you use would also have to follow the GPL guidelines for re-using such code.
Would I re-use KenL's code? No. Because I don't want to to be constrained by the GPL, and I ultimately respect a coder to have control of their own code. Which, ironically, is what KenL was complaining about (in a nutshell - SmiteWorks owning code and deciding what they do with that code) and he then decided that he wanted to own his own code (despite releasing under the GPL) and then withdrew all the code (extensions and modules) that he'd previously very kindly shared with the FG community.