I agree that seeing a picture of the installation may help. Although I am not taking sides, we are only hearing one side of a story here.
With that said, as an inspector, inspectors sometimes need to reflect back in their minds when inspecting and try to remember we are all on the same team, we may play different positions.
I mean we have an industry that we all belong to, and the end goal is the same for all of us...a safe installation. For the contractor add in; it is cost effective, and hopefully produces some profit to help keep the company healthy. Without healthy electrical companies, we are all worse off.
With that said, there is some wording I see that has been missed when reading the section in discussion.
I believe the CMP has purposely left some ambiguity in this section.
1. For the longest time there were no listed products for the purpose, as listing is not required.
2. There are so many ways to install this wiring method, that flexibility of the means for support should be understood.
3. The bottom line is the safety of the installation once it is complete.
With that said, does the method finally chosen to secure/support the wiring method actually offer a secure means of support and provide for the safety of the wiring method?
That is what I ultimately look for. Which means there are many ways to provide support that may not be "conventional", but we do not live in an old conventional world anymore.