Technologically? no. Thematically? oh hell yes. The walled city of Kowloon was a major inspiration for early cyberpunk. Not for it's technological prowess, because real cyberpunk isn't about technological prowess, it's about the reaction of human culture to ever increasing technological leaps, and how humans don't really change much even as they completely redefine the world around them in successively more rapid cycles. If you actually go and look at early 90's and 80's cyberpunk you can see the fingerprint of the walled city of Kowloon everywhere. The idea of a ramshackle construction, jury-rigged technology, a thriving black market at the feet of corporate arcologies, that is the essence of cyberpunk.
A lot of people don't really consider GitS to be cyberpunk, because cyberpunk isn't supposed to be about the people in power, it's supposed to be about the people living in the cracks. The people just getting by, living in places like Kowloon where you might manage to hammer together a receiver dish to steal some satellite TV for entertainment, where the stall on the corner is selling hard copy pirated software, where building codes and laws and regulation are something only rich people are silly enough to worry about. The Major and section 9 are sort of the opposite of cyberpunk, they've got the tech, but not the punk, there's nothing remotely punk about them, they're cops for fucks sake.