I re-read it and looking more at the tests and... I think you're right but also maybe OP is confused about how the audio spectrum works in general then, because they themselves talk about this 70hz shelf in the same breath as human vocal ranges etc -- that isn't amplitude modulation frequency. But maybe there is just something here that is lost in translation or I'm just not getting the real purpose of these test measurements.

If I'm a bit more imaginative on this 2nd read of their 'experience' of these tests it seems that maybe yes, they hear 'something' at higher frequencies but it just just broadband noise- broadband noise mind you, is, all frequencies... so I was confused at how someone could say they 'don't hear anything above 70hz' and yet can somehow hear 'noise' at '2000 hz'. But it is dawning on me that the implant / associated driver hardware may simply be 'saturating' when the spectral content of audio is too large at all those frequencies, and OP can actually 'hear' something, but it just blurs into white noise when the spectral power is too high - kinda like there is a massive amount of reverb being applied to everything over 70hz.

But again they talk about their struggles with understanding voices and whatnot but if they are hearing parts of music at all then they could be hearing people' voices shifted into bands and toned down to amplitudes that helps them. Like, clinicians with experience here should be helping with this and it is kinda insane that this person is attempting to discern anything themselves.

The exposition is strange and again that could just be the translation and writing style but some of those little bits and just the way I've seen some people literally start spiraling when they start to pair-autodiadict with AI - coupled with the fact this is a medical condition and a life-altering disability - along with a few other small oddities in this post - make me kinda worried there is a lot more to this than posted and OP may need other kinds of help with their situation.

Thank you for pointing out that the 70 Hz is a modulation rate, not an audio frequency. That's exactly right. I wish I could find someone in Korea to help me with the hardware side, but no matter how hard I've tried to persuade people, I've mostly been ignored. As for the Lean part, I wasn't sure whether it was really necessary. I've never been part of academia, so I'm still very clumsy and amateurish at this. Even so, I'll keep doing my best to find someone who can help with the hardware side. Thank you for your kind words.

I pleaded with the cochlear implant company to do research, telling them I desperately wanted to know exactly how I hear, but unfortunately, the only answer I got was that it would be difficult. It makes me feel so sad and helpless.

I think the presentation of the whole situation was just a bit jarring to me because it is a wild combination of topic (the hearing implant) coupled with the fact you had to translate (can always be difficult with such a technical topic) while using AI to summarize and edit your entire investigation, published as a Claude artifact - we're really seeing a new kind of blogging here, and that for sure caught me off guard.

I see your situation more clearly after re-reading and also seeing your new responses here in these threads.

I think if you write more on this topic, especially more about your history of hearing and what you can in fact perceive, and publish more on the internet, you will find people who are very interested in this kind of topic - it is something that will 'nerd snipe' many tech minded people - and I am sure you could absolutely make friends in Korea who are interested to help. Having someone with an audiology background, or even a student in neurology who knows their way around audio signals processing / has a DSP / EE background etc. sit in with you for some experiments as you use the line input for you device - someone who also hears what the input is, and can talk with you about it - would be invaluable and could also be a fun social connection- maybe university students, etc. If I spoke Korean and lived in your city I would definitely find it fascinating to try and help out.