Reduced risk of dementia by treating hearing loss?

A former patient of mine - he is a hearing care professional - gave me a brochure about the latest hearing aids from the American company Starkey. It is fascinating to read about the transformation that hearing aids have undergone in recent years. Once upon a time, they were devices that were designed solely for the purpose of
improve hearing for people with hearing loss. Now they are interactive devices that allow users to stream mobile phone calls, television, music and other audio from their smartphone to their hearing aids.
There is a clear link between health and our hearing. A quote from Starkey's brochure: "People who can hear well are more connected to the world around them, so that they live better and healthier lives. There is increasing evidence that when hearing loss with hearing aids
This can improve or slow down a number of serious health problems. These include cognitive decline (mental activities) and dementia. A recent study has even shown that treating hearing loss is the best change a person can make to reduce his or her risk of dementia. The studies have been described in renowned medical journals, such as The Lancet.
With a hearing aid manufacturer as a source, this naturally sounds somewhat biased. But I certainly agree that good hearing is important for our daily functioning. It prevents isolation and helps older people to remain active. Both physically and mentally.
In my book 'Stop Stress' I have devoted an entire chapter to the influence of sounds on our bodies and especially on the nervous system. For example, there are music therapists who use specific frequencies that cause 'resonance' in the body. This has a very beneficial effect. In a broader context, it is known that certain music generally calms down.
This is used in public spaces. This music reduces stress and aggressiveness.
But then you have to be able to hear it well.