When I say that, I mean it's easy to take what the module gives you and change it around to fit it to a custom setting/story. It gives you the stuff you actually need to run sessions of Lancer, mainly the enemy compositions and battle maps, and just enough narrative framing for it all to make logical sense. The minimalistic story is admittedly a downside for those who want more interesting and complex roleplay in their sessions. But greater complexity means less plug-and-play, typically.