Planetary Citizens working as intended?

So I browsed in the .xmls a little and found this:

UnitColonyStatDefs.xml

<UnitColonyStats>
    <UnitType>Worker</UnitType>
    <Stat>
      <EffectType>Manufacturing</EffectType>
      <Target>
        <TargetType>Colony</TargetType>
      </Target>
      <BonusType>Multiplier</BonusType>
      <Value>0.3</Value>
    </Stat>
    <LevelEffectStats>
      <EffectType>Manufacturing</EffectType>
      <Target>
        <TargetType>Colony</TargetType>
      </Target>
      <BonusType>Multiplier</BonusType>
      <Value>0.01</Value>
    </LevelEffectStats>
    <NeighborBonuses>
      <GiveBonusToNeighborType>Manufacturing</GiveBonusToNeighborType>
      <NeighborBonusValue>1</NeighborBonusValue>
    </NeighborBonuses>
  </UnitColonyStats>

The upper parts detail the stats as one would expect them. The boldly marked ones surprised me. I have not seen any indication of workers (or scientists etc.) increasing any adjacencies.

Is this a bug or intentional, that this is not working?