I've got both the Zephyrus and Zephyrus V2. I haven't used them in quite some time, but it was a pretty nice vape with the factory coils if I recall. Big coils and a lot of cotton in them.
Both of mine came with a rebuildable deck as well as the two factory coils. Maybe they released a version without the rebuildable deck, but I'm not aware of that. I think the deck was the same for both versions if I recall. I've still got a good number of factory coils and haven't used mine in a few years, so I haven't ever tried the RBA.
They aren't talking about rebuilding the factory coils. You should have gotten an RBA in the package.
Hope this helps some. It was a really nice tank and vaped well at the time it was released. I was primarily using the STM at the time, sometimes I switched out for this as a change. The Zephyrus vaped well for me, no leaks or dry hits, etc.