The aircraft properly configured could have flown itself to VMC with no problem at all....with a minimum of input from the Pilot.
If it had been Force Trim-ON, ATT Mode engaged, resetting the pitch attitude to a climb attitude and ensuring adequate power was applied to maintain a positive climb rate would have been all of the immediate actions required.
A couple of subsequent actions to engage the upper modes and then the Pilot would have been able to progress from the Aviating to the Navigating and Communicating while monitoring the aircraft performance.
He could have done nothing but the immediate actions for the short period of time it would take to regain VMC.
Examination of the past practices of the Pilot, Training and Checking, Operator SOP's and established procedures, review of Aircraft Check Lists would produce the information needed to show why the Pilot was not prepared to cope with a simple straight ahead climb following an IIMC event in the daytime.
The other aspects of how he got into that predicament are a different matter that also bear scrutiny.