The MN police don’t use it?
https://www.google.com/amp/s/www.nytimes.com/2020/05/29/us/george-floyd-kneehold.amp.html
One Google search lets you see while controversial and taught to be used rarely, it’s still used.
But unless they find some pretext to hang these four (like happens to civilians all the time when they offend some pettifogging official, so sauce for the goose is sauce for the gander), it won't matter.
He died on camera while begging that he couldn't breathe, died calling for his mother who had been dead a year, and with multiple bystanders calling out "Stop, you're killing him" and pressure on the neck continuing for 2 1/2 minutes after he emptied his bladder and bowels. Brain death takes four minutes. And with a smug shit-eating bullying stuporous grin on his face as the guy dies, no evidence of tousled hair or clothes, no record of needing or trying a night stick, taser, or gun, hence you will never convince a jury that they needed to hold him down like that once he was already handcuffed and on the ground.
You will never get a jury to like him unless you exclude that video: and if you do, public opinion will irrevocably harden beyond repair against the police and the entire city.