I may be wrong but that thread seems to be where all the concern about the GMAC seems to have started. It seems like this group is looking for someone to blame for the new permit setup, the ultimate responsibility still stays with the WDFW, in my opinion. 
You are correct that the WDFW is responsible. However, GMAC is the
only group mentioned that supports the change. That seems rather shallow. If there is broad public input, they should be able to mention lots of groups that support it.
"“This plan is designed to give hunters more options for getting the special permits they really want,” said Ware, noting that the proposal was developed with broad public input and support from the WDFW’s Game Management Advisory Committee.