Yes, I know that some claim the tech isn't ready for a Pilot Plant launch. I disagree it is about the tech not being ready. In my view it is about cashflow, or lack thereof. And it is about who controls the rights to the tech (whoever pays is going to want a big say or big piece of the pie).
At the very least the Alstom deal Phase V is leading towards a potential pilot plant. It makes sense from both MVTG and Alstom's view to see if the German government will help fund it.
I think what wasn't ready in 2015 when it came to a Pilot Plant was MVTG's checkbook to fund a launch on their own. They will likely need help, from somebody, if it is ever going to happen. JMO.