They simply found evidence that 1) the more often one has occasional tinnitus the more likely it will become permanent and 2) the longer a tinnitus lasts, the more likely it won't go away again and 3) people having permanent tinnitus have neuronal brain changes that can be measured, in contrast to those that only suffer from occasional one.

The only thing treatment related, or "actionable information" one could derive here is that its prudent to aggressively treat those with frequent occasional tinnitus or a tinnitus that already lasts longer than normal but isn't considered permanent yet.

I have noise induced tinnitus and have found that benzodiazepine makes it completely silent. That silence comes with a pretty steep price though, in regards to the side effects. So there certainly is potential for a cure, and there's always a few trials going on. One that's particularly interesting is https://www.withpower.com/trial/phase-3-tinnitus-6-2021-925a.... I don't remember where I read it, but the reason they're trialing Etanercept is because they tested it on 12 people where I recall 11 of them experienced quieter tinnitus. If it works, then we have an FDA and EMA approved product for treatment.

Anecdotally, some people find magnesium supplements helpful.