If I’m pulled over while being white and I cooperate, I’m probably getting the ticket and going on my way. Worst case the cop is having a bad day and wants to escalate, they arrest me for something. If I’m black, worst case I’m going to the morgue. Average case is going to be worse if I’m black, all other things (including my attitude) being equal.
When it comes to actually getting killed by cops I don't think this is true. The vast majority of people killed by cops are doing something very foolish like pointing a gun at them or rushing them with a knife.
So the statement by the poster above holds - if you don't point a gun at a cop (figuratively), your chance of surviving contact with police if you are Black are no lower than other races.