Maybe this zero emission truck is a modern day version of "Smake Oil".
In an earlier post exhalt stated that the strategic plan was to product these units in 3 plants - Middle East, Europe & North America and they plan to source materials and key component locally to meet production targets. here is his exact comment -

"we will source locally as much of the products as we can so say North America all the fabrication work & painting work would be done locally , engines would come from a North American plant as would many other parts."

This would lead me to believe the European version of this unit would have a different engine and other components and the one in the Middle east would also be different - maybe yes maybe no. I would think the engine characteristics (combustion chamber, intake manifold, fuel injection design, etc would have a lot to do with achieving zero emissions. At least that what I was taught when I earned a BS degree in Auto Engineering and what I learned in 41 years in the lift truck industry to be compliant with standards like CARB and Tier 1, 2, 3 etc.
Yes his launch dates keep moving around up & back and are hard to keep up with them - kinda' like trying to eat a" soup sandwich" I say.
Hope I'm around in 2019 to see this thing should be interesting. I'm not from Missouri but just "Show Me" 7 Ill be a believer - unless it is "Snake Oil".