Your question is not 100% clear to me. (Could be me, its been a long day!)
They argue that the code doesn't cover this due to low voltage
I believe this is wrong!
Rules 30-1202 to 30-1208 apply to extra-low-voltage lighting systems. It seems you have a codebook so check it out.
BTW, check out the "Scope" in section "0".
If your province has adopted the CEC then low voltage is covered by the code.