Video analysis on Type-093/A/B Shang SSN by an retired U.S Navy sonar officer running a Submarine/Gaming channel on Youtube. He seems to claim the hump observed is tied to 093's towed sonar array system; He also asserts no VLS capable Type 93 is in service, and will be introduced as 093G. Not sure if his assertions are credible but he may have inside track information on this topic.
Here is another analysis video he posted a while ago on AN/SQS-53C Active Sonar, a variant of which is mounted on both Ticonderoga and Arleigh Burke-class ships. Not sure why NSA hasn't knocked on his door yet.