It's fake. It's a bad 80s -style porn clip to fetishize Black cocks.
That is definitely NOT fake. The black actor went by the name of J.J. Wad. The full scene shows him cumming. He did not do very many movies. There is another one where he fucks a black actor named Randy Cochran after Randy gets him hard with a brief blow job. He is genuinely at least beer can thick or larger, esp towards the base. In the encounter with Cochran, he goes from soft to hard while being sucked (although he does not get as hard as in the gloryhole clip). As he gets hard, it looks like Randy is sucking on a forearm.
By the way this site is mostly about big cock fetish in one way or another be it black, white, gay, straight or whatever, as well as dozens of other big dick "bad porn" sites on the net, so what is your point singling out this one?