But once I read the explanation it became quite clear since there isn't really other ways to interpret it.
It could be a common way to trick the initial sensor from the publisher. Because most editors wouldn't notice that. But it won't hide from the mass. Once it's get published it would piss someone off.
To be fair, I knew HongKong and GuangZhou area are still very traditional, rooted with a lot of these ancient Chinese language games. People there might be much more conscientious looking for word games than I do.
Also, this slogan is often interpreted as protestor declaration for wanting HK independence.