This looks like a very interesting treatment and hopefully it's legit! Especially interesting is that the results persist for at least the year after treatment.
The data for the patients is presented with the article as an image. I've copied some of the chronic data for each patient from the image to a spreadsheet (attached as Korean Treatment.xlsx).
According to the article:
"Age and tinnitus duration were also associated with poor clinical outcomes because of the likelihood of chronic maladaptive neuroplasticity and complex causes (for example, age-related hearing loss, cochlear cell degeneration, or psycho-emotional pathology) of auditory and non-auditory systems. Therefore, tinnitus should be treated as early as possible after its onset because auditory maladaptive neuroplasticity refractory to the treatment occurs ≥3 months after tinnitus onset."
which, at least for me (59 years of age and approx 5 years duration), was a bit discouraging.
So, I graphed the VAS reduction at 1 year vs Age and Duration. Doesn't seem to be that much of a difference.
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