It will work on actual 64 bit devices. But not in the simulator. It's been like that since day one as per @omz himself.
BTW I've been thinking of doing something:
since the template is a little out of date now, I wanted to update it with the newer additions such as objc_util....
If @omz would be ok with it, I'd like to put the template on github (maybe we could make it private for forum members here only if that made him feel better?)
and from there we could make fixes to it etc, so that @omz doesn't have to spend his valuable time working on what is probably a niche add-on to Pythonista on which his time is not as well-spent as working on Pythonista itself.
While we're on the topic -> does anybody know away to make the dropboxsync.py script include the libraries where objc_util is located?