Honest answer: for some people, yes. For most people who have had it for more than a year, the sound itself probably will not disappear, but the suffering can. That distinction is worth holding on to, because it is the whole game.
Acute tinnitus — the kind that follows a concert, a sudden cold, a stressful week, an ear infection — often fades on its own over days to months. Chronic tinnitus, defined as ringing that has been around for six months or more, is much less likely to vanish completely. What does change, and what is well documented, is the brain's relationship with it. Most people who go through structured care — sound enrichment, CBT-based reframing, hearing aids if indicated — describe a slow shift from 'this is unbearable' to 'I noticed it for a second this morning and then forgot about it'. They still hear it. They just stop suffering from it.
That is what habituation looks like, and it is the realistic goal. Anyone selling you total silence is selling you something else.