the kind that correctly uses XML for everything.

Why do you believe that using XML is better than JSON in every case? Or am I misinterpreting your comment?

I took it as sarcasm. The "for everything" was the tell.

Poe's Law; it's impossible to tell. There are presumably some companies who think that using XML for everything is appropriate, so it stands to reason that there actually are people who believe that as well.

Do you know any of these?