Mike gives us firsthand information re the weather.
If he said it was really bad.....it was really bad.
The video shows it to an uneven and varying kind of cloud, mist, and fog.
We have to remember it is what the pilot can see outside the windscreen of the helicopter....or side windows or chin bubbles....that matters.
I think we can all agree the Pilot found himself in weather that caused him to crash instead of being able to land safely somewhere either by making a visual approach and landing or an instrument approach and visual landing.
From his radio transmissions and the radar track....we also can assume he was "lost" in a place he knew well.
After that....we are all guessing at what transpired in the cockpit.