Interesting.

Well, on approach power is used to control rate of descent, not speed which is controlled by pitch so a lack of power could, for a given airspeed cause a rate of descent such that the aircraft would potentially land short. Trying to correct (reduce) that rate of descent (and, avoid perhaps landing on the road) by pitching up could reduce airspeed enough to cause a stall. It's unclear that this is what happened but it's plausible.

600 feet isn't much of a margin for engine failure, especially double engine 'failure'. The engines may be fine, it could be that communication between A/T and throttle control and the engines was at fault. That worries me far more.

Hard on grass is more appealing than soft on a busy road so perhaps that was the trade off the crew took. Again, this is lay speculation. I'll look forward to reading a more detailed report with, hopefully detailed conclusions.