Comment by DominikPeters

It's not just cutting. The answers were obtained by taking still photos and inputting them into the model together with detailed text instructions explaining the context and the task to the model, giving some examples first and using careful chain-of-thought style prompting. (see e.g. https://developers.googleblog.com/2023/12/how-its-made-gemin...) My guess is that the video was fully produced after the Gemini outputs were generated by a different team, instead of while or before.