False, it is not investigated for those people who have tinnitus because the hearing aid has not ended tinnitus, it is investigated because there is nothing that ends tinnitus.
If hearing aids were used to end tinnitus, even only 10% of people, all doctors would prescribe hearing aids for those affected by tinnitus. On the other hand, you must have hearing loss to wear hearing aids, which means having tinnitus does not imply hearing loss.
The point is that it doesn't make sense either because it is not true that hearing aids cure tinnitus in those who have tinnitus due to hearing loss.
I challenge you to show me a single study confirming that hearing aids cure tinnitus, a single serious study confirming that people with tinnitus who wear hearing aids stop hearing tinnitus. That is false, only unverified anecdotal cases are counted.