I know his chemistry (how DEF works) is wrong. So the very basis of his supposition is based on incorrect information.
I will not be testing the freeze thaw cycle at varying concentrations to prove what Cummins already stated, again, I trust them and the experts who created the standard. I think those Q&A's are good enough information.
Further, yeah, this is splitting hairs, but I still think this method would be construed as defeating an emission device. As this article states
https://www.ppclubricants.com/is-all-diesel-exhaust-fluid-def-the-same/ , if the mixture is not 32%, it cannot be referred to as DEF. If Ram and Cummins state to use DEF (further, if they list the ISO standard, and I'm sure they do) in your truck, and you are not, technically you are not following the requirement. Again, unlikely to get caught but again.....there are some compromises here that seem risky, especially when you consider this appears to be a solution looking for a problem. I'm sure there was a helluva lot more testing in the creation of this technology and this standard, than what TC did in his garage. Further, to claim there is no reason for this required concentration (when there actually is), and to imply they don't know what they are doing, but he does, he is likely to get a response.
I have no issue if he is going to do it, or others, but if he is going to claim they all got it wrong, but he got it right, some folks (like me) are likely to come by and challenge it.