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Does new Star Wars continuity only affect post-Jedi EU?

I have read this press release a couple of times.

In order to give maximum creative freedom to the filmmakers and also preserve an element of surprise and discovery for the audience, Star Wars Episodes VII-IX will not tell the same story told in the post-Return of the Jedi Expanded Universe.

Does this describe material set after Jedi, or published after?

Is it also saying that only things published as "Legends" are now non-continuity?

I have read that it is only films + Clone Wars + Rebels that are now in the main continuity but can't see this sourced by Lucas Film Story Group. Does anyone have a reference for this?