"just a 3G baseband chip" does hide an enormous amount of complexity. The point is just that this design contains both non-open-source hardware and non-open-source software (running on the 3G baseband chip). It's still mighty cool!
Except it's not "just" a 3G baseband chip. That chip[0] runs a closed source software that even contains a Lua interpreter. That's a proprietary binary blob that I don't know what it does, so this is not something that I would call "open source" even if the controller is open source.
