It doesn’t take many little hints. Someone on likely the same FB page posted their brag post about their “secret spot” with a 5 second clip of a beaver landing to pick em up. So now everyone has the operator’s info and can draw a circle. When called out, the guy said good luck finding it, there’s 200+ lakes in the area. In that post you had info on what type of plane - so now you can eliminate 70% of said lakes based on size alone. Also had mountains adjacent to the lake - now you can eliminate another +50% of the remaining lakes. Mountain topography was detailed enough you could see where to look for distinct drainages and a bowls. The lake had a long gravel shoreline in the video. Hop on google earth and look at the 30 lakes next to mountains large enough to land a beaver on. Then narrow em down by mountain topography + the gravel bar. You’d have the guy’s “secret” spot where he killed two monsters within an hour of looking around google earth.
By the way, that FB page about “DIY Alaska” likely referenced here is about 95% percent the worse info you can imagine.