This clip is currently being hosted on the site of a now-former 3D Realms employee (though it can no longer be accessed publicly). It’s full rummy 51 of, supposedly, Duke Nukem Forever gameplay footage.
https://kotaku.com/is-duke-nukem-developer-3d-realms-gone-for-good-updat-5243277
You’ll see many of the same enemies from that concept art that surfaced the other day, so rummy best it certainly looks rummy golds legit. It also has boobs, so don’t watch it at work.
https://kotaku.com/duke-nukem-forever-screen-shots-artwork-rise-from-3d-r-5245883