Adaptations and drafts count as "EU" in the sense that Adywan won't reference them just for the sake of it. He's not going by what Lucasfilm officially calls "EU", he just uses it as a shorthand for "everything Star Wars that isn't on-screen".

Of course, it's up to Adywan if he wants to put such a scene in, but if he does it will be because it adds something good to the film in its own right, not just because it was in a different version of the story.

Re Han saying "It isn't friendly", it makes enough sense as is; it's technology, and it isn't Alliance technology. For all they know at that point it might be harmless, but it isn't friendly, and it's not worth taking chances on.