He is in national forrest. Not wilderness. unless something has changed in the last twenty years.
Thanks for replying to my post, but National Forest lands also include Wilderness Areas managed by the Forest Service such as the Mt. Baker Wilderness area that was established in 1984 that I posted above from the sectional map - but I was not originally implying he was in a wilderness area, only pointing out that people who want to fly from inside it should be aware of the wilderness area and should respect the rules there.
But since it has been pointed it out, I believe it does appear that the flying was shot from above tree line, which if on the north side of Mt. Baker as OP noted above, would definitely put it inside the wilderness area boundaries within the Mt Baker-Snoqualmie National Forest. It does not necessarily mean OP was standing in it though.
There are locations on the south side of the mountain where you are outside of the wilderness though, like Park Hill trail that does go by some very picturesque areas and some lakes and tarns. So there some great places one can fly there legally, just not so much on the North side if you want to get above treeline.
Again, as the law stands, you can currently fly over a wilderness area as long as you are standing outside of it, and as long as you don’t carry or land/take off your drone inside of it. This is quite easy to do in many areas as roads leading through or bordering a wilderness area where vehicles may drive are not part of it and the wilderness boundary can start right off the side of the road.