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"Killing accuracy of a mile?" - Not if its coming from a .22 bore.

Exactly. Just because the box says it can travel/kill up to a mile away does not mean you can target something a mile away and reliable hit it.

Once the projectile goes subsonic, it will become erratic, quickly destablize and plow into the earth.

In the standard service rifle, we shoot at 600 yards. The .223s are iffy at that; which is why shooters go to more stable bullets, heavier and longer barrels, and dial-in a tremendous amount of elevation - the normal "come up" from 200 yards to 1000 yards is 36 minutes - 360 inches!!!! @ 1000 yards.

Most scopes don't even have that much elevation in them.

At our competitioin, we still use the pits - you can even hear the .223 projectiles at supersonic speeds flying over your head. We necessarily wear ear protection.

~This is not in regard to the special ammo mentioned.
But regarding no silencer since explosion heard.
A silenced rifle could still be the case.
If using high velocity ammo the explosion can be supressed.
However the sonic crack/explosion will be heard when it refects off objects. The location the sound came from
doesn't have to be the origin of the shot fired. Also,
a properly suppressed rifle will hide the flash.

I've shot competitions with M-16 with standard iron sights to 500 yards, and we got spotting scopes to use between shots. If you stand behind somone shooting at that range you can see the turbulence with the scope that the bullet leaves behind, and every time it'll peak at about 6 feet over the impact spot when it's at the midway point.

In any case, these shots the sniper is making are friggin easy by any standard, it's the egress without detection time and time again that's the tricky part.