You can't find a good answer because there isn't one. The valve lift/duration vs compression ratio means that if the valves are timed incorrectly they will hit the piston, which means it is technically interference. Also it has a few hundred dollars of special tools needed to set the cam timing, instead of just some marks on the gears, which is a sign of an interference engine.
The shape of the combustion chamber and a few oddities of that particular valve train mean that when the cam is in a neutraled position (so when the timing guide goes, or the rear jack shaft bolt breaks) the crank can spin 360 degrees but the valves are in far enough that they won't get hit, which is a hallmark of a non-interference engine. I have seen many 4.0 SOHCs that is timing drive failures while running with no bent valves.
This is where the confusion happens.