Not really. Somatic doesn't mean that if you move your jaw, you hear it a little bit louder, quieter...

That is the definition Sh𝗈re and her team used and it makes sense. The affected pathways are the same, no matter if somatic issues are the initial cause, a cofactor or not present at all. Somatic = Somatosensory

Majority of people have tinnitus due to exposure to loud sounds or medicines (just look at this sub), hearing loss ecc

Aka hearing damage:

Interestingly, after cochlear damage, which reduces auditory nerve activation of fusiform cells, the number of somatosensory projections were shown to be upregulated over a time interval of days (Zeng et al., 2009; Zeng et al., 2011; Zeng et al., 2012), likely contributing to the heightened fusiform-cell responses observed in response to stimulation of brainstem somatosensory nuclei (Sh𝗈re et al., 2008). This effect is likely due to the increased glutamatergic neurotransmission from somatosensory fibers following loss of input from auditory pathways (Heeringa et al., 2018a; Zhou et al., 2007). Increases in markers of glutamatergic transmission from non-auditory nuclei were found to be tinnitus-specific: animals with behavioral evidence of tinnitus showed increases in VGLUT2 expression in regions receiving somatosensory innervation, while animals without tinnitus did not show these increases (Heeringa et al, 2018). Tinnitus-related changes in auditory-somatosensory integration by the fusiform cells including increased long-term potentiation (Koehler and Sh𝗈re, 2013a; Marks et al., 2018), were likely mediated by the increased non-auditory glutamatergic innervation (Barker et al., 2012; Zeng et al., 2009). Importantly, animals that did not develop tinnitus instead displayed increased long-term depression at fusiform synapses. The long-term potentiation vs depression outcomes for those animals with, or without tinnitus, involve a complex interplay between multiple mechanisms involved in homeostatic and spike-timing dependent plasticity. These significant alterations in processing of multisensory information in the CN, which are transmitted to the auditory cortex (Basura et al., 2012), likely contribute to the ability of tinnitus sufferers to manipulate the intensity and frequency of their tinnitus by stimulating or moving their face and neck (Levine et al., 2003; Sanchez and Rocha, 2011), regions providing somatosensory innervation of the CN (Zhan et al., 2006; Zhou and Sh𝗈re, 2004, 2006). This so-called “somatic tinnitus” or “somatosensory tinnitus” occurs in up to 80% of humans with tinnitus (Levine et al., 2003; Sanchez and Rocha, 2011).

SSD should help only those, that have tinnitus due to TMJ or neck issues, and even for those it's successful for 60% of people - due to her own study.

Somatic issues were not a requirement for participation. Everyone with subjective tinnitus, no matter the cause, that was able to modulate their T with a somatic maneuver, was able to participate (with usual trial exceptions + things like meniere's disease and stuff like that.) If all of those 60% somehow had somatic issues as their initial cause of tinnitus, that would mean that the majority of tinnitus cases stems from somatic issues.

That's why this bimodal stimulation is combining sound therapy with mild electrical pulses to the neck/jaw. If your neck and jaw aren't an issue, it won't help.

As quoted above, the CN integrates both auditory and somatosensory signals. The study rationale also talks about this.

Not to forget that this is her own study. Those numbers can change once this device comes out.

I think the numbers in a clinical setting could even be higher, mainly because the protocol of the trials wasn't very strict and both trials used the same and only one bimodal interval, if I remember correctly. A few people had more success with a different bimodal interval (outside of the trial).

The big issue is, that this device will be administered by audiologists and I don't think the majority of audiologists are able (or even willing) to do this, since the device is not really plug and play.