The Resighini Tribe is about 40 people, Tolowa Dee'ni is about 110 people. The biggest one is Cher-Ae Heights, 130 people. The largest tribe in the area, not part of this announcement, is the Yurok, around 3000 people. So this is just a small subset of the local indigenous groups making this declaration.
These smaller tribes talk about conservation and the environment, but their main activity is running this casino:
https://www.funattheheights.com/
I do think it is important to preserve the natural beauty of Northern California, but I think the state and national park systems are doing a pretty good job of it, and I wouldn't want to turn the parks over to some local casino operators.