oh, that is normal, it is only for Python modules created from JeVois Inventor. We do not yet have a way to parse the module for documentation purposes, and thus we do not yet detect in the inventor whether a module supports no-USB-out or not.
So, during creation of the module, we just add stub docs to the module which contain this "maybe" word (since we do not know for sure).
This will eventually get fixed when we port the doc generation from comments in the source code to within the inventor.
If you want to support a mapping with no USB output, you need to write a function
def processNoUSB(self, inframe):
in your module. This is the one that will get called when using setmapping2 to set a no-USB-out mode.