i doubt you are half deaf.
it's possible your system, or the AS-2000, already is mitigating the static charge on your media. or something else is doing it so the delta of change is not audible.
or the rest of us are nuts.
or at least more nuts.
i've not used any of these negative ionizers myself, only the DIY hair dryer/Tourmaline screen device. that i tried in multiple systems with a consistent audible result.
btw; i also use an Acoustic Revive RL-30 Mk 3 Lp demagnatizer for Lps and silver disc media which also worked in a similar way but at about half the audible effect. it's sits outside my room next to my KnsLAUDIO record cleaner, but is rarely used.
https://www.thecableco.com/rl-30-iii-multi-large-demagnetizer.html