I strongly believe this will be one of the solutions to the tinnitus problem. Given that its an electrical stimuli issue, we can only assume that we will alter how it affects our senses by either adding or removing to that electrical stimuli.
If I understand the article correctly, this is simply a TENS treatment in the form of a headband, approved to treat migraines. There have been studies suggesting that TENS is useful in treating tinnitus. See, for example, the paper by De Ridder (attached) that explores the use of TENS in treating somatic tinnitus.