You guys are all ****ing stupid -.- Its Amaterasu. Back then Amaterasu wasn't revealed in the anime or manga. Just that it uses black flames. Amaterasu is also the Goddess of the Sun
Which is why in the game they made a black sun. With black flames -.-
Here is another video of a player selecting the moves, if you pause it you can see the name of the move before it is played each time. [video=youtube;oEDsFKTIO4I]https://www.youtube.com/watch?v=oEDsFKTIO4I[/video] The name of this move is VISUAL JUTSU: THE SUN GOD. So yes it is a dojutsu and yes it involves Amaterasu. If you pause the video at 1:09 you can see all the ultimate jutsu listed in name. In case you're lazy and don't feel like it they are:
Tsukuyomi:Nightmare Phantom
Tsukuyomi:Black Nightmare
Visual Jutsu:Flame of Misfortune
Visual Jutsu:The Rising Sun
Visual Jutsu:The Sun God
And for the record Amaterasu was mentioned by name in the game previous to this so that logic is failed.