What's interesting to me is that the examples he gives are beautiful because of their sincerity. Even if there is artifice, or they're being formal or playful, their style reflects their reading, their shared culture and of course as you say their audience - which I think for them was a very small elite.
Anyone who writes in a flamboyant style now - as the essay's author does - necessarily comes across as a kind of pastiche. There is something camp or affected about it. Maybe that can change. Maybe a new flamboyance can develop. But I think his antiquated style of flamboyance is unlikely to come back to real life.