I would still think it would be quite painful to remove such lenses while deployed. Especially if suddenly responding to an unexpected act of aggression. Is the PLAN expectation that they will know of any activities of war ahead of time, so that they may leisurely remove the lenses in the hangar deck?
The Luneburg lens should likely be able to be ejected in flight if needed, pylon inclusive, similar to external fuel tanks for stealthy aircraft (J-20, F-22).
I could see the benefit of a "non-retractable" Luneberg lens for carrierborne aircraft in the sense that in a naval environment it is probably preferable to have a more mechanically simple way of "removing" a deployed Luneberg lens (i.e.: simply eject it), versus a retractable Luneberg lens (with corrosion and naval environment there may be a higher risk of failure to retract).
The ability to eject a Luneberg lens is really just for peacetime environments if an aircraft mid-sortie needs to change to stealth-mode. During wartime, the aircraft would simply not be installed regularly as part of its fitout.