Can copy that and it should work for everyone else, too, because you basically making creating the missing frequency that is missing and filling that missing space or you are adding to the already boosted section and increase the resonance of that area!
I think off Interval barks in Soundgym for a good training to recognize the resonance when you match the boosted frequency and either the full sound when you fill in the missing or hear yourself boosting it when comparing a cut to the original with filter off.
I thought about using this method, too as it really helps me, especially with the cut frequencies, but It rather helps your ear to focus on resonances than to distinguish spectrum areas without assistance.
Think of learning to ride a bike but adding support wheels. It can be very helpful and supportive at the first, but you should go on and remove them later or else you won't be able to ride without them.