That studio video is of her recording a verse for a Jessica Mauboy song (she's famous in Australia I think) according to the person who posted it on here a few days ago.
She then performed the song, complete with the requisite dance moves, while mentioning the GOP frontrunner and the Vice President in her verses, which had to be odd for those still in attendance in the Lincoln Center ballroom.
Then it got weirder. In the spirit of the season, Nicki conducted her own impromptu poll, asking the audience, “Do you think they like that song? Who do you think likes the biggest butts, Donald Trump or Joe Biden?”