Yeah. The details are in the article. Officer had his knee on the victims upper back for at least 30 seconds while the victim begged the officer to move as he couldn't breathe. At some point he stopped responding entirely while the officers were holding him. He needed immediate medial attention from the instant he stopped breathing. Instead of helping him officers told him "shut the fuck up you're fine". And only after he had stopped moving for 5 minutes did they check and realize he was dead.
The knee on the upper back position is illegal. The correct thing to do is to have 1 officer hold his shoulders steady and the other hand cuff him. If there's only 1 officer present (which there never should be), there are many other holds that are not life threatening. I think it's entirely fair and legitimate to say that they killed him. It's not libelous, or exaggeration, they killed him and did not seek medical attention when he very clearly stated he wasn't able to breathe. That's manslaughter and negligent homicide at least.