I don't think that it makes a big difference overall. Often when a person (or animal) dies, the urinary and anal sphincters relax, and there can be involuntary urination or defecation.
I have seen where Mr Floyd stops moving, and appears to lose consciousness from the bodycam footage.
Of course, without full vital sign monitoring, and/or a doctor on scene, we cannot be sure when Mr Floyd actually died.
If he was in fact alive, but unconscious in those last few minutes, perhaps it could be argued that the slow EMS response contributed in some way to to his death (delay to reach ultimate care at the hospital), which could possibly be used to lessen DC's culpability in the death of GF. I am just trying to think through possible defense strategies, and NOT agreeing/disagreeing either way (MOO).
I was actually surprised that Nelson did not object strongly to the FF/EMT, or either paramedics stating that GF was dead at the scene, as none of them have the training or legal ability to declare death (without consulting a physician) AFIK.