I don’t believe the rifle was suppressed.
A supressor has no effect on the supersonic crack of the bullet.
Odd mistake for this gentleman to make.
Even if it were .22, the range of 150 yards falls in the middle of its effective range. In the right hands modern .22 ammo is quite effective at 150 yards. I still suspect .223 because a single shot killed a woman whom the shooter was not aiming at. I am curious, at 130-150 yards would a .22 round still have the ability to penetrate bone, I would like to see ballistic tests on that. .223 would absolutely kill at 200 meters even to 300 meters which is the range we trained at when I was a Marine.