It's just the author's dry, tongue-in-cheek British humour. He's not really attacking anything – just a bit of fun using English instead of American English.
The author is British? OK, well I'm surprised. Nobody in Britain uses the kinds of phrases he makes fun of. I enjoy dry, tongue-in-cheek humour; it's my stock-in-trade (except when I might be talking to foreigners, like here on HN; it can easily misfire).
I read the author as being a non-British English speaker.
That's Jeeves and Wooster. And that was itself a parody.
I use some archaic phrases; I refer to "chaps", some disgraceful act being "a bit off", my hat is my "titfer" (cockney rhyming slang hasn't been restricted to cockneys since the 50s). But I don't pretend to be an Edwardian bourgeois twit, like the ridiculous Rees-Mogg.
I'm sorry I didn't get your humour; it's a drag to have to explain a joke.
I read the author as being a non-British English speaker.