Squawky
You may be onto it. There was allegedly an engine bay fire prior to this? Damaged hose unnoticed? Subsequent failure of the hose could be a possibility.
Even still, many pilots have had oil up the windscreen and oil smoke in the cabin, to crash it like that so far inland and away from the water? Hard to understand but possible.
Looks like a good report might follow. I hope they publish the data.