>>2378409I'm pretty sure I found it.
I took a look at this frame and guessed there was a hydroelectric dam on that lake. Looked up hydro dams in Switzerland, first result was Barrage du Sanetsch. Looked it up on Google Earth and everything seems to match. Compared this location with different drone angles on the YT videos and yeah I'm 90% confident this is the place.
https://earth.google.com/web/search/Barrage+du+Sanetsch/@46.36369391,7.29731881,2039.16717693a,986.3008611d,35y,-105.62392205h,64.34971285t,0.00000085r/data=CigiJgokCRdg7QB7ZUFAEVPGhwuU7EBAGfpUhSs_RGBAIWdJFS2rDmBA