Evidence in Chauvin case contradicted first police statement (apnews.com)
Experts say the problem of inaccurate police reports is widespread. The initial report made no mention of Chauvin's knee in Floyd's neck; it just attributed Floyd's death to "medical distress." A similar report was cited in the Eric Garner case.
The article notes a growing chorus of complaints about police misinformation, which is being thwarted by video evidence and body cams.
However, police departments still sometimes withhold video footage, refusing to release it to the public.
The implication here is that, without video evidence, police probably would have gotten away with even more killings. Video technology exposes these police departments as liars.
"Have police now begun to lose the default position that they’re truthful?"
Yes, in my opinion. Of course, many of us already knew the brutality of police departments and their corrupt, mendacious ways. This is why more oversight and transparency are needed. All video feeds should be managed by a third party agency and released immediately upon public demand.