My mother used to live in Belgravia, in one of the buildings pictured in that article, when she was a young girl. ....well when I say lived there, my grandparents were caretakers so they lived in the basement. This was back in the 1960s mind, but even back then Belgravia was an extremely affluent area, with Lords, major industrialists etc living there.
Most of the home owners referred in the article don't live there for more than a few weeks a year - if at all - there is a material inbalance
I live in a village where people buy 2nd homes or they buy to retire - the locals slowly drift away to nearby towns to live in shared accommodation
The life gets sucked out of the village over time - house prices go up - but the problem is deeper than that - the school closes, the public transport frequency reduces (nobody commutes), the local shop closes (as pensioners/visitors buy online for delivery), the pub closes ... the only infrastructure with any growth is the doctor surgeries - more of those are planned right across the county
It's not a sustainable position - there are 2 families in a village with 80+ houses - the few businesses that are left have no pool of resource to hire from - we live next to a cow farmer with 400+ cattle - he has no help - in any normal world he wouldn't be working from 6am to nightfall like that