The ‘Professor’ in the clip is in fact the real-life linguistics consultant used for the film and taught Michael Fassbender (David) the dialogue. I managed to track down the consultant, a Dr. Anil Biltoo of the SOAS Language Centre in London, to see if he could shed some light on the mysterious final scene.
The Linguistics of Prometheus - What David Says to the Engineer
Prometheus Bluray Easter Egg: Language of the Gods
The Mysteries Behind the Prometheus Deleted Scenes - A Discussion with Dr. Biltoo