He clearly means hands on dash and don’t move them, as in “show me your hands” — which requires movement.
The desired payoff for a traffic stop is a high-profile felony arrest. The questions to the occupants are intended to justify "probable cause" for the officer to search the vehicle and occupants for contraband.
There is also the possibility of finding that one or more passengers has an outstanding warrant for arrest. That is a perfect win for the officer.
Of course, things do occasionally go sideways.
This shooting appears to be a case where things went sideways. The first officer followed his training correctly and all of the responding officers appeared to be very professional and controlled in their actions.
I believe it was a justified shooting.