A lot can happen over 40 years. That Japanese documentary footage with a visit to Elstree and interviews with Kubrick and his daughter Vivian, (who directed the making of doc) right after The Shining was released only surfaced a couple years ago.
There’s been some confusion for years with the U.S. and shorter European cuts co-existing, but never specifically labelled as such.
It’s a miracle those in theater recordings for Star Wars and ESB exist at all.