This was an instrument rated pilot in a single pilot instrument equipped and certified helicopter complete with 4 axis autopilot. So, yes, it could have easily flown in this weather on instruments by this pilot safely.
However, the 135 operation was certified for VFR only. This had to play a roll in his decision not to go to the instruments. He flys these for a living, is the chief pilot, and knows the regulations. Many years ago, and even recently when questioning other newer pilots and student pilots, I ask the question; What should you do if you inadvertently fly into the clouds. They all replied “I’ll go to the instruments and do a 180”. This is a very bad idea. Instrument pilots set up their air craft equipment and prepare mentally for an instrument flight. Cruising low below scud is no place to set up instruments while single pilot in a helicopter. His head was out the window until it was too late.
The FAA use to have a Vertigo machine, that would force pilots to make movements that would bring on spatial disorientation. It is more disabling then blowing a 2.0 on a breathalyzer.
The hairs in your inner ear that let you know everything is level get screwed up even worse when you turn your head while turning the aircraft. Before going into the clouds this guys head was on a swivel looking outside the aircraft.when he went into the clouds he did what everyone I’ve asked said they would do… turn… do a 180… It is exactly what brings on spatial disorientation.
Low with instruments not set, and his head outside… he was set up to fail. Sad.
Don’t turn if this happens to you, climb out straight and as level as you can. Once you feel comfortable on the instruments… 7700. This is an emergency ?
You should have had an idea of what is in front of you before you went IIMC, climb out straight so you have some idea of where you are. If you do a 180, you will not pop out of the clouds where you went in. Don’t even try it. It has killed many pilots.