Keep in mind, I have not seen the dwelling. So take this reply for what it is worth:
There are very few "attics" here in Florida. If it is "roof space" (space between trusses) where equipment is placed, other codes may even come into play.
My first suggestion is to take up the problem with the general contractor, not the EC.
Certainly whatever the space is, would not in my opinion relieve the burden of protecting NM cable that is "subject to physical damage." Normally the electrical inspector can make this call, since he is the one that was there. So my second suggestion is -- if your supervisor is satisfied that the NM cable isn't subject to physical damage, then ask him/her if they would not mind signing off (provided of course, that everything else is OK). I'm sure they went there and took a look for themselves prior to making any decisions.
If someone gets shocked or killed because they came into contact with an unprotected cable, then the supervisor's signature is on the inspection record.
Again, take this response with a grain of salt because I did not personally view the situation.
_________________________