definatly not human, if you look in the frame by frame the hands are like the original alien's hands the index and middle stuck together and the pinky stuck to the other with an extra pinky plus the arms are really long
and the suit has a bizarre biomechanical look if you look where each body part is jointed for movement
i really dont know what that is probably the jockey really doesnt seem like infected crew, i think the one charactor with the bizarre infection had withcome to the conditions or something like a severe form of embolism