It's mentioned in the preceding article and the two papers that are linked.

In spite of the title no one is wondering if aliens moved planets around to park them in special orbits. It's infinitely more likely the resonances developed naturally.

Also, none of the planets are in the habitable zone, so it's unlikely there's life on them.

Which is a shame, because if the star was much dimmer and they were in the habitable zone, the views would make a stunning tourist attraction.