Yup. There is, in fact, a supermassivie black hole at the center of this and every other galaxy that is observable. It has been proven by measuring the speed of the orbit of stars near the center of each galaxy - the stars whip around something invisible at blinding speed and sometimes lose streams of material to the black hole. If you watch how fast the middle dot is spinning in the video, I believe they did use the black hole in their equations.
Fascinating stuff.
Well...this brings up a fascinating 'chicken or the egg' question as relates to the video and the timeline they propose.