All interesting theories about multiple coincidental failures.
But honestly, the most likely scenario that fits the wreckage trail and aforementioned witness accounts is the Somatogravic Illusion. Look here
https://www.atsb.gov.au/media/5226668/199003089.pdf
Impact at 183kts and a 150m wreckage trail shortly after takeoff. Uncanny resemblance.
More known for dark moonless nights, but equally well can occur in fog.
Admittedly the PIC was by reports experienced and less likely to fall into this trap.