in the manual for my Zipp SL bars it does indicate a max torque for it. I've also seen other carbon parts without threaded parts to have torque limits.
Specifying a torque value for a non-threaded part hints strongly at incompetent engineering. (Or, more charitably, a moment of extreme engineering sloppiness).
A torque value is meaningless without thread pitch. This is equivalent to specifying a maximum speed in meters. In both cases, the value is means nothing on its own and more information is required.
I'm glad you found the information you needed. While using the lower torque value, I'd still check very carefully to ensure that all parts are secure. At best, a handlebar that slips while riding is irritating. At worst, it causes a crash.