D-link support says here at Step4 that it should be possiible to disable the wireless via "Enable wireless" checkbox:
https://eu.dlink.com/uk/en/support/faq/cameras-and-surveillance/dcs-series/how-to-set-up-wireless-on-my-dcs-2670l
My camera with latest FW has nothing like that - I mean, the page for wireless setup is there, looks the same, but the "Enable" checkbox is missing. Camera is always visible as bluetooth device.