I don't know about the style guide, but I can't imagine they don't have their own in-house guide.
I'm sure they have their own style guide. Most publications do. I don't think TNY has dropped the Oxford comma as AP style recommends.
Well, that's true. My own employer has an in-house style guide. Most entries are about local things; they rarely try to reinvent the wheel of AP style. They *might* differ on Indian/Native/indigenous terms, I suppose. We used to say Indians at least on first reference, and it's possible we've loosened up on that. But that's the only thing I can think of offhand.
When I worked for St. Jude Medical they had style preferences on a lot of medical/scientific things as well as advertising norms, etc. I was on a three-person team of wordies having fun rewriting the guide when all of a sudden SJM was bought by Abbott and our stylebook was mostly obsolete. But AP was the underlying default.
I think similarly most publications mostly adhere to an established style -- maybe most typically AP or Chicago Manual or MLA. But
The New Yorker's in-house style guide seems needlessly quirky and generally not in a good way. The diaeresis aren't (wait, is that plural?) exactly needed but not really a problem. And I can't imagine TNY going for really recent AP additions like using % or allowing "their" for a generic individual, like "If a doctor tells you to exercise, you should obey them."
But spelling out big numbers makes reading harder for no good end.
And other things we've talked about are just weirdly annoying. "So and so, ... blah blah blah blah blrah, ... said.". The use of "got" in past tense where most people would say "gotten."
And I don't know if this is an official style matter or just David Remnick's way, but starting almost every story with a who what where when lede -- including, when possible, an exact date -- is weird, unnecessary and in many stories might be less appealing than various alternatives.
And they'd probably point to their venerable traditions. But they obviously aren't ironclad. I'm sure Mr. Shaw is already spinning in his grade over the allowance of swear words.