In the real world, there is an applied standard. For example a screw usually tightens in a clockwise direction. Rotor head rotation is described as viewed from above. Aircraft yawing left as viewed from being the right way up and looking forward. Not outside looking in and up side down.
So I do not see your point of view.
My point is that if the statement came from a by-standing Joe Public type person, looking up at the aircraft as they heard the bang, they would describe the rotation as they saw it.
"In the real world, there is an applied standard." The 'applied standard' of describing directions of rotation that you mention, can only be relevant if the eye witness describing it, knows what the standard is.
"For example a screw usually tightens in a clockwise direction." Don't do much car mechanics then do you? A right handed screw/bolt has to be turned the 'wrong' way if you come at it from a different angle!
"Rotor head rotation is described as viewed from above. Aircraft yawing left as viewed from being the right way up and looking forward. Not outside looking in and up side down." As far as Joe Public is concerned, the ac
appeared to have rotated counterclockwise before it crashed"
This would mean that the aircraft from their view point
appeared to rotate anticlockwise, regardless of your applied standard that as I mentioned, they might not know about.