Actually he is not incorrect. Given the limited data that is public, given that the permitting process is not complete, at this time the gov is not a big fan of Pebble. That being said, I don't think he is closed minded on the project. Read through this to get a better idea on where Bill stands. https://www.alaskapublic.org/2017/10/04/walker-doubles-down-on-opposing-pebble-mine/