Prestige cars, mega yachts, private jets, and corporations that make rockets and satellites are also male jewellery.
But the article: it's repetitive and slightly rambling and reads like it was written by some variant of GPT.
The point is fair, but it's also well known to class watchers. In the UK nouveau means a gigantic new build mansion full of chrome and glass, a private gym, and plastic and dental surgery. Old means a small country estate, a Georgian pied-à-terre somewhere near the City, tweedy clothing, and perhaps some pedigree dogs. And horses.
Old money tends to underdress - sometimes sloppily - and on casual acquaintance is indistinguishable from the merely middle class.
It's not until you get an invite to the manor house that you discover the ridiculously impractical and expensive Aga stove, the collection of wildly expensive antiques whose prices are never mentioned [1], the relaxed air of charming quizzical bafflement. (Very few of these people are unusually bright or talented. But socially polished - yes.)
The visuals are not the point. Anyone can tweed, but not everyone can tweed like they've been doing it their entire lives and really mean it.
[1] A 17th century silver spoon for £5000? How fascinating!