I appreciate your post.
At the most simplistic level, anyone can grow shrimp. To be clear, drop three PL's in a fish tank and as long as your filter works, you will have shrimp. Commercially viable means producing at a cost in which you can turn a profit. Until SHMP completely scales any facility, no one knows what the cost will be. I am quite confident they don't know that number.
Commercially viable means growing shrimp on a consistent basis at a price in which you can turn a profit. Right now, they don't even have their PL supply figured out. Without a virtual guarantee of PL supply, you don't have a commercially viable system.
I also believe you are leaving out the genetics part of the equation.
Finally, I know you have posted multiple times on the stress of the shrimp. The shrimp will always be more stressed than a native environment. Maximizing water quality helps with the stress but in no way will the stress ever be the same as a native environment.
The bottom line is they have never really proven anything.