This is actually good news.
Hate to be a downer, but I was told exactly this after my Mum had a scan because she'd been uncharacteristically delusional on heavy antibiotics while in hospital for diverticulitis. "It's probably the antibiotics" I was told.
The next year she fell apart as dementia took control and major symptoms became obvious. So I'm not in the least bit convinced by this kind of wording. Normal ageing includes a degree of brain shrinkage, but they can't see the causes or know what's happening in the surrounding 'normal' tissue. Behaviour tells us more about that, and Mum's delusions were a sign that her rational brain was only
just in charge at that point.
You're right though, there's always a slim chance the symptoms aren't dementia-related. We don't often seem to get folk coming back saying that's the case, but then bad news always spreads fastest.
Anyway, getting folk to appointments they don't want to attend is not fun. My tactic of getting Mum
so cross she wanted to go to doctor, then memory clinic to give them a piece of her increasingly frazzled mind was not fun, and gave me weeks of grief beforehand. But desperate times, desperate measures. Hopefully a bit of gentle subterfuge will be effective in Beesbee's case.