This site states this specific disclosure directly, in more than one place: Golden Brain is not a treatment for dementia, Alzheimer's disease or any diagnosed condition.
This exact boundary appears in the site's "talk to your doctor first" list, its FAQ, and its footer — worth reading that repetition as this site treating the distinction seriously rather than as a one-off disclaimer.
This site links directly to the National Institute on Aging's own explanation of normal forgetfulness versus something more serious — worth reading that resource if memory changes are specifically worrying you or your family.