If a person holding a weapon, (whether it has an orange tip on it or not) refuses commands, then deadly force would not only be permitted, but would be expected.
I saw the post he was commenting on and it is not in the same context as what you are saying.
“sneeze and I’ll blow your s#$% away” is what the supposed cop stated. That sounds like someone who shouldn’t have a gun let alone a badge.
The loon in this case didn’t decline any commands so use of deadly force would be murder.
This has gotten to be the case though cops are still bound by laws that only allow use of deadly physical force to protect the officer's life and/or the public safety. Is the officer or the in danger when the officer issues an unlawful command which is not obeyed? State laws differ on self defens against rogue cops but private citizens have been found innocent through a self defense claim. When an officer makes a public threat to blow someone away, his subsequent actions are surely open to question. Depending upon the circumstances, I personally might choose to make my own case for self defense.
You are correct!