Former (UK) magazine editor. I’ve never seen “lede” on any publication I’ve worked on. “Standfirst”, “intro”, sometimes “lead” (though that was more often used to describe the positioning of a story on a page). But never “lede”.

It’s possible it was used in UK newspapers, but I doubt that: most newspaper jargon found its way to magazines eventually (subbing markup was the same, for example). I suspect it’s purely a modern US newspaper affectation.